Ovulated before medicated FET?

Grace • TTC #1 for 2 years - Husband has non obstructive azoospermia due to late maturation arrest. IVF #1 - Successful mTESE but BFN and none frozen😔 IVF #2 May 2019🤞🏼

Hey there!! Looking for anyone who might have had this experience. I am currently in the middle of an FET cycle and have been on Lupron for the last 3 weeks to stop myself from ovulating. I went in today for an ultrasound and I have a large follicle on one side so they think I might be ovulating even though Ive been on Lupron and Estrace!! SO frustrating!! I had bloodwork done to check LH levels but I am just looking to see if anyone else has had experience with this??