I was doing IVF for the third time and before my result I got my AF .. people said sometimes if it's light etc you can still be pregnant but mine was heavy, cramps etc. I also did a Crystal Clear and also seen a very light line. I was convinced that it was a partial take or something...

Well you can imagine my surprise when the nurse called and said I was pregnant!!! Now I have the little stick stuck up on my wall

Good luck and more importantly