I just turned 17 when the same thing happened to me. I started my period like normal and then it became weird like. bleeding to the point where alright im off my period and then it would start right back up again. Well. I found out I was pregnant. TA- DA yah I know. and guess what sweetie... he pulled out to... I got pregnant off of PRE! Sweetie your only 13 and trust me there is things out there that you dont even what to know about getting using unprotected sex. Wait until your old enough to have a health class because believe you me...you will regret it
and yes pull out method is very unsafe . plz use pills for cotraception.
u can't be prgenant . ur bleeding is usual too. wait fro another2-3 days and see f u still bleeding then plz talk to a doc.