Hi Anna,
I was given a blood test on day 12 then (depending on the results) an ultrasound on day 13/14 (where they counted and measured the follies), then day 21 tests. I o'd everytime on day 14ish and had really good follie counts each time (one time we were even told maybe we shouldn't DTD as we almost had too many).
I was a Clomid success in every way - except no BFP ! But then we found out that i had loads of endo, so that was our problem.

Wishing you all the best.