Long post but I need help any suggestions

Jamye

I got pregnant at 17 and again at 23 both real quick no problems. At 25 got pregnant again after 1time that month and ended up having a missed miscarriage I was supposed to be 11weeks the baby stopped growing at 8weeks and had to have a d&c we waited almost 2years to recover from the lose and focus just focus on our other 2kids our boys are now 11 and 5 and we have been trying for another baby since march 2018 and couldnt get a positive. Neither smoke or drink. We started taking a vitamin called conception after one week of use I finally got a vvvvvvfp and had a misscarriage the next day went to my obgyn he tested me for lupus, autoimmune deficiency and progesterone levels everything came back good and my progesterone was 13.5 he told me just keep taking prenatals I started taking prenatals called rainbowlight and got another vvvvvfp had another misscarriage 2days later. Stayed taking those prenatals and went ahead and started taking a extra 50mg of b6 just took a test negative. What the heck could be going on. I ovulate every month I get the cramping pain everytime it is always 9days after my period ends me and my husband have sex every other day up to my ovulation day my period is like clock work. And my obgyn said for my husband to have got me pregnant that many times that his stuff is good. I'm so lost and hurt and confused both different obgyns I go to saying just give it time and keep taking prenatals. I dont know where else to turn for advice