Fertility specialist?

Caitlyn

I just had 2 miscarriages within the last 7 months one at 6 weeks and the other at 7 weeks, and I have a healthy 2 1/2 year old. My OB is testing my hcg levels to make sure they go down properly but when I suggested other tests to see if there were any other issues going on, I basically got blown off. When is it too early to see a fertility specialist? I think I've low progesterone but I just had a miscarriage Monday so currently I can't test for that. Anyone have any advice or experiences?