What Causes Bleeding After Intercourse?

dear doctor im a 21 year a girl i had sex for the 1st time today and i started bleeding. this started 2 weeks back when my boy friend fingered me and there was a little bit of bloody so we thought that was for he's nail and the same thing happened the next day and we thought it was cause the wound dint have time to heal, but after giveing it a break of 2 weeks we had sex today and i started bleeding a bit more than usual ...please help me