Progesterone high enough for pregnancy?

Falyn
Hi ladies,
I had a blood test on CD 20 (couldn't get to test centre on CD 21) and my progesterone levels were 28 nmol. Do you think that's high enough to have ovulated and get pregnant? I've read online it really needs to be above 30. We BDd every second day from CD 7-19. 
Annoyed as my specialist didn't call to talk through my results and I can't speak to her now until Monday. 
This is my third round of clomid. Round 1 @ 25mg, rounds 2&3 @ 50mg. 
Thanks for your advice!