No Period after miscarraige

I am very confused. I am 18 yrs old and had two miscarraiges in the lst two and half years. The most recent was three months ago. I am not confussed about the miscarraige. I had my period like abotu five weeks after and havn't had one since and has been about two months. I've double checked to see if i was pregnant and the test were negative. I havn't had a check up since. And i am getting very bad abdominal pain. I know i should see a doctor, i'm scared and don't know what to do :'(