Femara and Ovulation

Hello, so this is my first month on 5mcg of Femara which I took CD5-9. I went in on CD 11 and my lead follicle was 12mm I went back in on Monday and the lead was only 9.8mm they tested to see f I ovulated which I hadn’t. The nurse told me to come back Thursday or Friday for them o check again. I really hope that I’m not fully out for the IUI. I bought OPKs to also monitor at home. Today I am definitely feeling some ovary twinges... I’m hoping that means the follicles are growing. Is that a good sign? Doctor and NP didn’t seem too concerned. On my own, when I ovulate, is usually CD20-23.... would it make sense that it would still be later on Femara? Any insights? My brain is in overdrive right now.