Periods after miscarriage?

Jo
So, I just recently had a miscarriage a couple weeks ago. In the month of February I found out I was 6weeks pregnant. A week after I found out I had miscarried. I haven't had my period since December?? I was supposed to have my period yesterday, but it still hasn't came? Should I be worried? Also, do your breasts still hurt after you miscarry and for how long? My blobs have already went up a full cup!