Its Hard To Explain, Im 19 And Me And My

Its hard to explain, Im 19 and me and my boyfriend have had a few time where we have had unprotected sex, I was a few days late for my period but before I could take a pregnancy test, I started bleeding with what I assumed was my normal period. I noticed the blood flow was alot heavier than normal but my family has a history of problems that have caused strange periods. That same day I noticed my cramps from my supposed period were getting alot worse, they were three times the pain of my normal ones but i thought it might be because i was having a heavier period. Well eventually the became so painful couldnt really move and no medicine or laying on my side on a heating pad helped. The cramps eventually moved all the way up my stomach, well i tired laying on my stomach and at this point my ribs began to hurt. I was now hurting from My vagina to my ribs and when i laid on m stomach it almost felt as if something moved. I got into a warm bath and it seemed to help, however, I was still hurting in my vagina. This three days ago and I am still hurting down there and I have felt "off" ever since. Me and my boyfriend however did have intercourse today around two and about thirty to forty minutes ago i went to the bathroom to change my pad. I looked down and noticed two hard yellow items that look like they are bone and are round in shape they almost look they were split in half. When i tried to look up my symptoms the other day they all pointed towards miscarriage is this the case?