Both my boys are a result of Clomid - 50mg - 2nd cycle and then 1st cycle.

I would suggest using Ovulation kits & temping. I never went for my Day 21 blood tests (I hate needles), and I didn't need to. Based on my temps and the results of the Ovulation kits, I was able to pinpoint exactly when I ovulated.

I also used pre-seed, because I didn't tend to get much EWCM, and both times I used it, I got pregnant

Good Luck!