4-5 weeks pregnant and bleeding after intercourse. TMI.

Kristina • Mama to 2 boys & 3 step kids
I posted this in another topic are and decided to post again to get more feed back. TIA.
My SO and I got intimate last night. From oral, to fingering (hitting my g spot), to sex. Kinda rough but nothing out of the ordinary from our usual. When we were done and we got up to clean ourselves, he noticed blood on his penis. There was also blood on the sheets and my vagina. I wiped to clean it. It wasn't constant blood and it wasn't heavy once I started cleaning it up and therefore stopped. No tissue or clots or clumps. Just reddish/pink blood. When I woke up this morning there was some left over that looked like light spotting. But tissue paper was clean after 2-3 wipes. No pain either. I've googled that the insertion of a penis and finger can not reach the embryo to cause a miscarriage. Could it just be my sensitive cervix and him rubbing against my cervix walls that caused this?
Thanks in advance. 
Update: still no more blood, no cramps, no back ache, just feeling a little sore on the cervix area. 

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