Progesterone?

Correct me if I'm wrong, but don't most women take progesterone pills before they even find out they're prego? Like right after ovulation? I have a history of low progesterone and the doc didn't even test for it....and told me that they don't give progesterone pills this early?!? I'm 5 weeks along! You wouldn't give it any later really or it may not even be effective...I think these nurses are looney.