Low progesterone not getting pregnant after D&C

Patient: Hi, I had a misscariage in July last year. The baby stopped growing at week 8. I had a D&C and since the I cycles were irregular. I should add that I got pregnant after trying only for 2 months.My doctor did day 21 progesterone test and my progesterone was 1.5 . He did another test on day 25 and it was 4.5. He thinks I don’t ovulate. Now it’s day 30 and so sign of period.1- Do you think low progesterone caused the miscaraige ? The miscarage was not due to chromosome abnormality.2- can I be pregnant ?Thanks,M