I have been TTC for awhile now and my AF has been pretty regular. Well, I spotted for a week during my fertile week. Then I was 18 days late for AF. I thought I started today, but was only when I wiped one time and completely stopped. Took tests and all negative. I'm not stressed or haven't changed anything in diet. I have appointment in 2 weeks but want some kind of idea of what could be happening. Has anyone had this before? Any advice or info is appreciated. Thanks!