That seems very strange. I agree you may need to supplement with progesterone, though.
I can't remember - do you temp? I've never been good at charting consistently but it is a good way to confirm O if you make it work.
My first appt with the RE was CD 33 and he could tell I had O'd due to looking at my ovary - he could tell which ovary had released the egg. He will point out follicles before I do the trigger shot but I haven't had him do a post-O ultrasound other than my first appt. I know you don't necessarily release all your follicles. Possibly you had a good-sized follicle but didn't release it? I'm just trying to reason through this.
Me (40) DH (47) & furbabies * m/c 7/08 4/12 11/12