This is my first cycle on Clomid; 50 mg, days 3-7.

I went in yesterday at CD 13 for a follicle check and my RE said there was one that might be ready in a few days but he didn't measure it. He initially said my lining looked "great" and didn't say anything after it measured it at 5.85.

Few questions... is it normal to have a slower response to Clomid? I usually don't have any issues ovulating on my own, this was to create a stronger ovulation. Can lining thicken up as ovulation approaches?
There was also free fluid behind my uterus consistent with ovulation but I haven't had a positive OPK & he didn't see a corpus luteum, so it's highly unlikely I already ovulated.

I'm going to call today and see if I can get in tomorrow or Friday for a quick scan to see if anything has changed, but I know there are some experts here who might have some insight!

ETA: I started this cycle coming off a chemical pregnancy/early miscarriage so I don't know if that would affect anything or not.