I had cramping on CD 11, sharp right side ovarian/pelvic pain CD 12, and cramping again CD 13. Glow didn't predict start of fertile window til CD 14. Luckily I started to BD CD 11, 12, 14 & 15 (today) to cover my bases. Safe to assume ovulation happened sooner than predicted? Hoping for a successful month! I haven't tried opks yet, waiting a few months if nothing happens. If you experience these pains is it usually before/during ovulation? I get them every month, but not always at same timeframe.