HELP ASAPPPP

I’m 15, i had sex about 2 weeks and a half ago. I’ve had very very light cramps for the past 2 days and about 2 days ago I also had this brown discharge on my underwear,and yesterday when my boyfriend was fingering me rough, I stared bleeding so much yet it stopped and I haven’t bled till that happened. Is this normal? I should be starting my period in 5 days. I can’t be pregnant because I have no symptoms and when we had sex he used a condom and pulled out way before he came.