Period after Miscarriage

Hey ladies! Quick question. How long after you miscarriage did you have your period? I had a miscarriage and August and I got my period In October, then I got pregnant again in December and had a miscarriage. I have not had a period since my miscarriage in December. It is now April.  Is this normal? have anybody ever went through this? 
FYI I have two beautiful healthy children. The doctor told me the reason why I had my second miscarriage is because my body had no time to heal and I got pregnant too fast after the first miscarriage.