Ovulation pain

Just curious if anyone else ever has uncomfortable fertile days. Today and yesterday are my most fertile days and I have been having the most uncomfortable gas pains and cramps. It's almost like pressure in my butt that you feel when you're in labor. I'm not trying to conceive at the moment but if I were, I know I would not be in the mood to have sex because of how uncomfortable I feel. I've discussed this issue with my doctor and I was sent for an ultrasound and blood test and everything came back normal. I also did some research and seen that it's common to have ovulation pain but I didn't see anything about the butt pain lol! Thanks in advance for your input.