Just starting

So

Hello. We are 29 (me) and 34 (him) years old but have been ttc for 15 months now with two miscarriages. I’m just starting to get a doctor in line to start whatever testing we need to do to see where the problem might be but I have some questions.

Can our primary doctor run intial blood tests?

Should I see my ob/gyn instead? Does he go there too?