Bled after sex....

Earlier today I had sex with a guy who was a little over average and he was in my guts!!!! After about 20 minutes of sex, he came in me but I had to wait 5-10 minutes to drive somewhere to pee (we did it in the car in a parking lot). But after I peed, I wiped and notice there was blood. Should I be worried or concerned??? I'm not a virgin, and I have the nexplanon.