What Causes Random Bleeding After Periods?

Hello, I am 18 years old and i have a few questions. First thing first im technically still a virgin. On march 12th me and my boyfriend tried to have sex but it didn't really happen because it was too painful. He only entered me a tiny bit and couldn't push all the way through due to it hurting so we stopped. Anyways last week april 6th-9th i had my period. And last night i discovered i began my period again it was first really red almost pink. I was spotting. But now today im having a period but a light one sometimes it is red or brown. What can this mean? Is it possible i am pregant?