You're probably ovulating from both and just feeling cramps on one side more. It's common. I always get ov cramps on the left (very rarely on the right) and assumed my right ovary was bunged up. Had a few scans to check it all out and it turns out they're both working fine! Baby was conceived with a right ovary egg, despite me feeling the o cramps on the left. So unless you're having your ovaries/follicles scanned every month, you don't have any way of knowing what side you ovulate from.