Emergency room worthy or not?

My husband and I had sex tonight for the first time in a couple weeks. When I got off of him that was an actual pool/puddle of blood on him and in between my legs (obviously). I went to the bathroom and bled and bled this bright but dark at the same time blood. I'm not cramping at all. I'm freaked out. This is baby #3, I'm currently 8w5d. Should I wait and see if the bleeding carries into tomorrow or if I get cramps or go ahead and go as a precaution? Could this just be from having sex?