Embryo Transfer Day: Superstitions and Science

Embryo transfer day is a milestone moment in every IVF journey. After weeks of preparation, medications, and procedures, everything builds toward this step. Hopes are high, but so are your emotions. While the science behind embryo transfer is well established, the day itself often comes with an added layer of rituals and traditions. 

Many hopeful parents find themselves leaning into small superstitions to get their lucky embryo to stick, some passed down in fertility circles and others newly adopted for an extra sense of comfort and luck. But what are these embryo transfer day superstitions, and where do they come from? Do they actually influence outcomes, or are they simply a way to feel more grounded in an otherwise high-stakes process? This article explores the most common embryo transfer day superstitions, their origins, and what the science does (and doesn’t) say about them.

French Fries (specifically McDonald’s)

If you’ve spent any time in IVF forums or Facebook groups, you’ve probably come across the tradition of grabbing McDonald’s fries right after transfer. This ritual likely started with advice for patients recovering from egg retrieval, since salty foods can help ease bloating from ovarian hyperstimulation. Over time, it’s become a go-to superstition for transfer day itself.

Spoiler: there is no scientific evidence that eating french fries, or salty foods in general, increases the chances of a successful embryo transfer. However, the joy and comfort of a salty, crispy bunch of fries increases the chances of a happier you, so… go for it!

Laughter

Laughter is often called the best medicine, and in this case, there may be some truth to it. One study found that women exposed to humorous clowning routines immediately after embryo transfer had improved pregnancy rates. While more research is needed to confirm these findings, the idea that stress reduction and joy could support implantation is compelling. Whether or not the science holds up, making space for humor on transfer day, whether through a favorite show, movie, or comedian, can boost your mood and ease anxiety.

Acupuncture

Acupuncture has been one of the most extensively studied complementary therapies in the context of IVF. The idea is that acupuncture may improve blood flow to the uterus, reduce uterine contractions, and help regulate stress hormones, all of which could theoretically support implantation.

Several studies and systematic reviews have examined this. A Cochrane review found that acupuncture on the day of embryo transfer may have a small beneficial effect on clinical pregnancy rates, though the evidence quality was considered low due to variability between studies. More recent meta-analyses suggest that while results are mixed, some patients may benefit, particularly those who undergo multiple sessions in the days leading up to and after transfer. At the very least, acupuncture has consistently been shown to reduce anxiety and promote relaxation, which can be valuable during the emotionally intense IVF process.

In short: acupuncture is safe when performed by a licensed practitioner, may offer modest benefits in IVF outcomes, and can certainly support overall well-being. If you’re curious about adding it to your plan, it’s worth discussing with your care team.

Warm Feet

One of the most enduring embryo transfer traditions centers around clothing, especially socks. Rooted in an old belief from traditional Chinese medicine, the superstition suggests that keeping feet warm helps preserve blood flow to the uterus, leading many hopeful parents to slip on cozy, “lucky” socks for their procedure.

Scientifically, there is no evidence that warm feet or special socks influence implantation or embryo transfer success. Uterine blood flow is not affected by whether your feet are covered or cold. Still, the ritual persists. For many, wearing “lucky socks” offers comfort, a sense of tradition, and a small measure of control during an emotionally charged moment. While socks won’t change medical outcomes, they can help create a more positive and reassuring experience.

Pineapple Core

Consuming pineapple (specifically the core) in the days leading up to and following an embryo transfer is another popular superstition. The idea is that the pineapple core is rich in bromelain, an enzyme with anti-inflammatory and mild blood-thinning properties, which could hypothetically support implantation. In reality, there’s no scientific evidence that eating pineapple improves embryo transfer outcomes.

Pomegranate Seeds

Sort of in the same vein as eating pineapple, some believe that eating pomegranate seeds or drinking pomegranate juice is a must-do practice around the time of an embryo transfer. Besides being a well-known symbol of fertility, pomegranate is full of antioxidants, mainly polyphenols, which protect the body as we age. So there is some research to support the idea that pomegranate may have overall positive effects on women’s reproductive health, including embryo implantation. We’re definitely waiting on more research and evidence to conclusively back this one up, but, hey – between french fries, pineapple, and now pomegranate, we’re cooking up a pretty good meal here. 

Taking a Walk

For many years, bed rest after embryo transfer was considered standard advice. However, recent research has shown otherwise. A large randomized study found that patients who returned to normal activity immediately after transfer actually had higher pregnancy rates than those prescribed bed rest. Additional studies have confirmed that prolonged inactivity does not improve outcomes and may increase both stress and physical discomfort.

That said, “normal activity” does not mean strenuous exercise. Gentle movement, such as a short walk, can support circulation, reduce anxiety, and improve mood without interfering with implantation.

Every patient’s circumstances are unique. Factors such as your medical history, ovarian response, or any complications during retrieval may influence what is safest for you. It is important to follow your clinic’s specific recommendations and ask questions if you are unsure.

Skipping the Shower

Another common superstition is around when (or if) you should shower on transfer day, as well as keeping your body at a “just right” temperature. Some people believe that avoiding a hot shower or bath will prevent overheating and support implantation, while others make sure to stay extra warm to encourage blood flow to the uterus.

In reality, your body regulates its internal temperature very effectively, and a normal shower won’t interfere with the transfer. That said, it’s a good idea to skip extremes — like hot tubs or saunas — since they can raise your core temperature in ways that aren’t recommended during early pregnancy. Otherwise, whether you want to shower before your procedure or bundle up in cozy clothes afterward is totally up to you.

Sending “Sticky” Thoughts

In fertility circles, “sending sticky thoughts” has become a lighthearted yet meaningful way of wishing someone good luck during their transfer. It captures both the science and the hope of this moment: that your embryo finds the perfect place to implant and grow.

Evidence-Based Ways to Support Implantation

While rituals and traditions can bring comfort, it’s also reassuring to focus on the practices that are actually backed by science. Research tells us that there are a few simple, everyday things you can do to support your body and mind around the time of an embryo transfer:

Before Transfer

In the weeks leading up, nourishing your body with balanced meals, managing stress through calming practices, and carefully following your doctor’s instructions can help create the best environment possible. Even small things, like prioritizing rest or taking time for mindfulness, can make a difference in how you feel going into the procedure.

After Transfer

Once your transfer is complete, most clinics recommend gently returning to your normal routine. This usually means avoiding anything overly strenuous while still staying lightly active. Focusing on hydration, eating well, and listening to your body can help you feel cared for during this waiting period. Most importantly, keep communication open with your care team so you feel supported and clear on what’s right for you.

Building the right support system

While the traditions or superstitions we’ve explored are never guaranteed to influence the outcome, what they do offer is comfort and community on an otherwise clinical day. If leaning into them helps you feel supported, then they have already served a purpose.

At Cofertility, we know how much heart and hope goes into every step of this process. We’re honored to walk alongside intended parents as they navigate both the challenges and the moments of joy. Whether you’re just starting to explore your options or preparing for an upcoming transfer, our goal is to make the path as transparent, supportive, and empowering as possible. Through our egg donor matching platform, you’ll find hundreds of incredible donors who would be honored to help you build the family you’ve been dreaming of.

So, on behalf of all of us at Cofertility, we’re sending sticky thoughts your way. May this step in your journey bring you peace, hope, and the possibility of something wonderful ahead.

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