bleeding during sex since starting the pill?

ok so since i started my birth control (Lolo) 2 out of the past 3 times i had sex with my boyfriend i started bleeding pretty badly in the middle of it and then id be spotting for a couple days afterwords? this never happened before i was on the pill. to be fair though he's pretty big and i'm super petite and we're generally pretty rough. has anyone else experienced anything like this?