bleeding/spotting after sex

I had sex around 3-4am and I wouldnt say it was rough, just lasted longer. I am in my third trimester 35 weeks and after we were done i went to pee and everything was ok. but noticed my stomach was in a weird position, 30 minutes to a hour after i went to the bathroom and I was bleeding and a small clot of blood came out, i put a pad on and went to sleep. I wipe and it's still little spotting but baby is moving and kicking. I haven't bleed since 6am, but should i go to the hospital or call my ob? I'm embarrassed about the sex part but was never told not to have sex.