AF came on 1/21, ended on 1/22. i was 4 days late, it was super light. That's never happened before. I haven't had any changes in my diet, haven't been stressed at all. My fiancé and I have been TTC for 4 almost 5 months now, every HPT i've taken was a BFN. Has this happened to anybody else? It's kinda making me concerned. Should I call my OBGYN or wait it out to see how next month goes?  (Not really sure what group to post this in so i picked the first one i saw😅)