Pre Ovulation twinges cd 8

NLM

Hi all I'm on cd 8 after taking femara 5mg days 3-7. Starting yesterday, I've felt twinges in my ovaries, pelvic region off and on, sometimes both sides, but mostly the right side. Also kind of down to my upper thigh or groin area. I'm wondering if I may O earlier than cd 15. I'll be using Opks from cd 11. Anyone else experience this?