We are both up to date on testing. And the bleeding did stop the next day. If its caused by a lack of lubrication or arousal, do I need to go to a doctor?

So my boyfriend and I have been sexually active for a while, almost a year now, and this hasn't really happened before. After having sex the other night, we turned on the light to find that there was blood everywhere, on his hands, on my shirt, and on the sheets. (We both freaked out initially, beca...