Clomid and VERY low progesterone

Okay ladies. So I'm kind of down in the dumps and don't know what to do. First off I have PCOS, but I do have 2 children already. Well long story short I have advanced ovarian aging and am slowly loosing my fertility. I am only 23. My OBGYN said I unfortunately don't have much time left so if we want another baby to do it now. Anyways, I just finished my first cycle of clomid 50mg (I haven't ovulated on my own in years) and had my 21 day progesterone blood test yesterday. I got the results today and my progesterone level was only a 0.5! My dr said it's extremely unlikely the clomid worked and so we are supposed to try a new cycle with 100mg clomid. My question is has anyone ever been in a similar situation and concieved?? My pro levels just seem EXTREMELY low. It's just hard to know we're running out of time!