Abdominal cramps when ovulating??!!!!

Aly • My son born 6/14/17 he is my rainbow 🌈 baby 👶🏽
I am 2 days into my ovulation window. 
I have been having sex allot. And today I am having a lower abdominal cramping feeling today. This is the first time this has happened. Is this normal? or has this happened to anyone else?