Abnormal period since miscarriage?

Jida
This period is my 2nd cycle since my mc. My husband and I are ready to ttc again. 1st cycle - my period started with 2 weeks spotting then a normal 7 days period. This cycle - started with 5 days spotting and still on going period ( 9 days and counting...? ) and both of my boobs is sore. Never happens with my period before. Can someone tell me whats going on?