15mm follicle cd9

I had an ultrasound to check and make sure my uterus didn’t have any structural issues after some of it couldn’t be visualized during an HSG. Everything came back great. I had a 15mm follicle in my right ovary on cycle day 9.

Do you think if I ovulated on cycle day 17 the follicle was mature enough to actually be successful? How much do they grow each day? I’m starting progesterone today at 2dpo and I’m hopeful this cycle will be successful after 4 losses.