Period is late. Bleeding during/after sex

I am about 7-8 days late for AF I’m on CD 35 and BFN when I test. I had a transvaginal ultrasound yesterday which showed I did ovulate and my uterine wall is 8.5 mm thick. My OB said to expect AF in about 7-10 days (😒). Yesterday and tonight when my husband and I had sex, I had bleeding the color of pink and a brighter red. And has stopped after we are done. Has anyone else had this and gotten a BFP? I’m worried somethings wrong as I don’t typically bleed after intercourse. Help!