Femara & multiple follicles.

Second cycle femara days 3-7 and 7.5 mg this cycle.

Cd11 ultrasound showed 4 follicles (or at least 4 worthy of measurement). Each ovary had two. Right had a 12mm and 17mm. Left had a 16mm and 17mm. O occurred four days later.

Unfortunately there was only that one us. How do cycles normally work with multiple follicles? Is it common for them all to rupture? Does it happen at the same time? And mainly, is it possible the 12mm kept growing and ruptured as well or would it have more than likely stopped due to the dominants?