Something odd..AF question

Has anyone had AF come early and then have an odd period when trying to conceive? I took a PT at 10DPO and it was negative and then AF showed up the next day...and now it’s completely different then I’ve ever had in all my years..normally I’m a heavy bleeder with debilitating cramps..and It’s so light and no cramps...could this be something else or am I just crazy?!