HELP! SORRY TMI

Okay so the 18th was the last day for my period. The 19th I had intercourse. Before I was gonna leave his house we did it one last time and when we were done. We cleaned ourselves and saw there was blood. We thought nothing of it because maybe I was too dry. Okay so I came home. And went straight to the restroom. When I wiped I saw there was blood then I looked down on my jumpsuit and I saw more. Why do you think that happened? I've never had that much blood before after intercourse. Then today 4/23 in the a.m. I went to go pee, when I wiped there was a spot of light pink.