If 95% of women get pregnant after 3 euploid transfers… why are so many women here part of the 5%?

I’ve got a few (more than 3) euploids stocked up and I will be doing a FET with one of them in a few months, then more attempts if the first doesn’t work. My doctor reassures me that by 3rd transfer of a euploid 95% of women will get pregnant and I’ve read the same statistic here. But from reading around here, it sounds like MANY MANY women here aren’t pregnant by even the 3rd try with a euploid. It’s making me so anxious, I don’t know what to think or believe.