I think I had a miscarriage last night..

I don't really know what to do. Sunday night I was leaking like a dime / nickel size. I put a pad on because I didn't want to leak anymore through my panties. Well I woke up in the morning and notice spotting. Then omg the cramps started. It started with pressure below my belly button and then my lower back would start to hurt. The bleeding got worst and the cramps went off and on through the day. I thought it was my period until something came out in the tissue when I wipe myself last night in class. It wasn't pleasant.. The bleeding has let up so much since then and now I am barely feeling a pad but there is still blood. Could it be?