AF stands for Aunt Flo.... As in your period.
what is AF?i see that on every forum!!
On the flip side, it could just be spotting and your cycle will be coming as planned. Not to be negative or anything but that has happened to me before and I thought I was pregnant. I for super excited and everything only for AF to come shortly after. If you happen to be late then that's definitely a better sign of pregnancy. Good luck!
It sounds like implantation bleeding.The egg is attaching to your uterine wall and most likely you are pregnant.You should wait at least a week to so you can take a HPT to be 100% sure.