Im on cd10 and just had an ultrasound. Nurse said my follicle is 21mm and will be getting a trigger shot in the next day or so. According to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation apps</a> I’m don’t ovulate until day 18-19 and the app is very accurate for my lh surge. I’m confused as to why my follicle is ready but I don’t have postive opks for another week? Can they do the <a href="https://glowing.com/glow-fertility-program">IUI</a> at this point ?