What Causes Heavy Ovulation Pain After A Miscarriage?

YYYY@YYYY had a miscarriage on the 12th January I was 7 weeks. Two weeks later I ovulated and I was in so much pain, Two weeks after that I had a period which was normal other than blood clots. Now I am ovulating again with very bad cramps. I have never had ovulation cramps before why is this starting now? is something wrong? I am 45 yrs old and everything is normal just the cramping at ovulation.