Progesterone level.. clomid ...help requied

Hi All,
I am on clomid 50mg CD5-CD9. I have ovulated on CD17, but my progesterone level on CD22 was 6.6. Got mensus on CD31 (today)
Please help me to find answers for the below questions
1. Why my progesterone level is low even though I am ovulating?
Also my doctor asked me to take 100 mg of clomid for next cycle..

2. Why I have to increase the clomid dose when I was ovulating.

3. Will the increase in clomid dose, increase the progesterone level..

Expecting your help... Thanks