Confused...

I sadly had my first MC in October and have since had a normal period. It was on the exact date I would have come on if I hadn't have got pregnant. My AF was due on the 27th and still no sign? I did a test on the 28th and it was negative?! I have no period symptoms, my boobs feel normal. Just lower back ache occasionally and this past week I've had nausea and dizziness and the dizziness has been quite bad a few days. Is it normal for my cycles to be late after a MC? Just wondering if anyone else had this problem after a MC. Got my hopes up too that we were pregnant again :(