waiting for my BFP

I'm trying to get pregnant for 8 months now I use preseed because I don't get egg white cm I am a 320lbs lady I am taking metformin 1000mgs i have been drinking alot of water and  Exercising daily and I have been taking  Prenatal vitamins for 3 months this month is round 2 of Clomid 150mgs cd3-7 I never had problems ovulation in the past or when my periods I had my son and my periods have not been the same I don't know when I ovulate opk gives me false positives I BD every other day bbt charting is not accurate it said I ovulated last month on the 5th but at my cd 21 blood work showed my progesterone was 3.6 so my ob said I didn't ovulate when I do BD I stay layed down with my legs up for 30 mins what more can I do we want to get pregnant