I'm in my third cycle after going off birth control (took last pill at the end of April and have had two 35-36 day cycles since then) and am five days late (today is CD 41). I've taken a TON of HPTs and gotten all BFNs, starting about a week and a half ago.

Has this happened to anyone else? Any clue what could cause this? I figure I could just be still getting back to normal since I've only had a couple of periods since going off the pill, but am just wondering if it's something I should check out.