First month

Hi, this is my first month being monitored. I'm on CD12 the ultrasound is showing 1 follicle at 12mm RE said we may be ready to trigger Monday night. My question is per my previous charting and cbfm I wasn't expecting ovulation until about CD25. No meds are involved in this cycle just trigger. Has anyone had experience with the egg maturing much earlier then ovulation actually occurring?
TIA!!

First month

I think that's my case this month! Recently I've had medicated cycles with trigger so not sure when I would've Oed without that but I did take one month off and I had a 30 day cycle which is O around day 16-17 now this month I switched REs and did an unmedicated cycle and today which is day 11 I had one follicle that was 19.5 already so I'll prob trigger tomorrow or Sunday and do iui Monday! Not sure if I let myself go without the trigger when I would actually release that egg. I love the trigger shot bc you know exactly when you O! Good luck!