12 dpo, 2 days late. BFN with FMU.

Danielle • Mommy to a precious little boy born 12/17/15 and full time working mom! I love my little family!
Hello everyone! My husband and I have been TTC for three months since I got off Seasonique in September. My period is usually like clockwork from CD day 30-33 when I'm not taking birth control. I ovulated at CD22 because I had a smiley on the CB digital OPK. I tested at 9 - 11dpo with both FMU and later urine and got all BFNs on different brands of tests. My AF was "due" yesterday according to my app at CD 34 and 11dpo. I had some slight spotting just when wiping at CD 30-31 so about 8 days after O. I was hoping for IB. I am having diarrhea/constipation so I've had a little brown discharge with straining but no other symptoms. I have some slight cramping at my belly button (higher than AF) but at was looking for some hope as to retesting later (maybe Wed) or just making an appt with my OB/GYN now. If I don't have AF/BFP by next week I had planned to go to the dr anyway. Has anyone gotten a BFN on day/day after AF was due and gotten BFP later?