From TikTok videos to fertility forums, the quirky ritual of eating McDonald's fries after IVF embryo transfer has become a phenomenon. In one such viral TikTok, a couple sit in a McDonald's car park and eats fries after their embryo transfer. 'You heard it's good luck to eat McDonald's fries after an IVF transfer, but weren't prepared for your friends, family, and IG aunties to show up like this,' the caption reads. One commenter joked it 'would make one hell of a McDonald's ad,' while another asked: 'Did any of you have McDonald's fries after your FET? For many IVF patients, fries have become more than fast food.