Shortened cycle on Clomid?

Natalie

So this was my 2nd month of Clomid (100 mg) I had a scan on day 14 and it seemed that I may have already ovulated but was difficult to tell. I started my period today (day 18) which is the shortest cycle I’ve ever had. Was supposed to get progesterone level checked tomorrow (day 20) Last month I took 50mg and it was only 21 days. I did not ovulate last month. My cycle has always averaged 26-27 days so I’m wondering is the Clomid causing my shorter cycles? Should I make any suggestions to my Dr about timing of next months scan to make sure we capture true ovulation? Just very frustrated at this point and wanted the advice of y’all who have been through it.