1st Period After Miscarriage

Sherri
I had a miscarriage 6 weeks ago. I was 6 weeks pregnant. This is my first period since and it feels worse than a normal period. The bleeding isn't heavy (yet) but, the cramps are intense! I've take OTC medicine for pain but, it's not making a dent in it. Has anyone else gone through a similar thing? Is this normal or should I call my doctor?