Originally Posted by
MrsEnglish
I think I'm 9DPO today, and I just know I'm not pregnant. Now I've been wrong about thinking that I was pregnant when I wasn't, but I've never been wrong about thinking I wasn't pregnant when I was (even to be fair, there was only one opportunity for that).
I read somewhere that a fertilized egg sends out signals that prepare the uterus lining for implantation. So my theory is that when I feel pregnant but don't get BFP it's because I had a fertilized egg that didn't implant, and that in cycles like this where I feel totally unpregnant, it's because there's not even a fertilized egg. I could be wrong though, I've never been that good at Biology.