Shackles- when I spoke to FS he mentioned the risk of multiples so the scans are purely to check the ovaries have not been over stimulated. He said it was up to me if I wanted a scan it isn't completely necessary. The day 21 progesterone blood test is to confirm if u have ovulated or not. If you havnt then they might up your clomid dose on the next cycle.... So I think this blood test is quite important as if it didn't work on a certain dose you would probably be wasting your time with the same dose on your next cycle. I'd definitely be asking the doc for this test!!!