Cycle after miscarriage

Kat
So I found out I had a miscarriage on 5/11. I was bleeding 5/4-5/6. My last period was 3/28 and it usually comes every 30 days faithfully. I've been Cramping for the past two days which is unusual cause I usually only cramp the first day of my period. Is this normal? When should I expect AF to start again?