Clomid 50mg v 100mg

Please help out ladies...

I have enough clomid for 100mg cycle. This is the first cycle, with out clomid my progesterone levels on cd21 are 0.5 I am overweight. Do you think I should just go for the 100mgs or 50mg?

Please don't say speak to the doctor, he is so supportive...4 years on this is the first thing he has finally given me but with no support.

I am desperate xx