Low ormones poor ovulation - miscarriage ?

We have been ttc for 3 years. Exams showed low hormone levels so prob poor ovulation. Did 6 months Clomid and 4 mts Tamoxifen. Nothing happened. Decided to get on with life but then conceived naturally- couldn't beleive it. At first it was thought to be Ectopic due to right sided pain and Hcg levels not doubling. Then they found sac on scan but no fetus. So waited 10 days at which point I should have been 7 weeks. They saw fetus and heartbeat but said it measured 6 weeks. Great but then started bleeding and 2 days later was definate miscarriage. As anyone could imagine this has been a terrible rollercoaster. Now I am concerned that the low hormone levels meant that it was almost inevitable that I would miscarry and that if I do manage to conceive again the same will happen. I'm not sure my sanity could take it. I'm wondering if I have luteal phase defect although this was never even mentioned the whole time I was seeing the fertility specialist. Any help would be greatly appreciated.