Ovulation supplements and test

I am 37 and we have been ttc for 10 months now. I have had 2 kids before and got pregnant without trying. So I didn’t expect to have any issues. Two months ago we had a very early miscarriage. We use baby dance and he takes a fertility supplement (can’t think of the name) and I take a prenatal. I just tested and definitely not prego. I have a couple questions so hopefully someone can help. When taking an ovulation test how many days are you at your peak because I only surged one day? Also what supplement is recommended for boosting egg production? Thank you in advance 😀