TTC after three losses

Hey everyone! I'm a mom of three kids and after my third child was born we wanted a fourth that ended in a missed miscarriage at 8 weeks. Ii then had two more miscarriages. My last miscarriage was last year they all have happened back to back. I have been going to my OB since last year in November I've had just a few labs done he doesn't want to do more. So now he wants me to start with clomid I've only had two periods this year skipping a month in between but still tracking ovulation. I'm also doing things natural with herbs since last month. What are other test I can have done? He also told me to start taking aspirin and when I do get a positive pregnancy test to start taking progesterone as soon as possible. I did have low progesterone with my last two pregnancies that ended in miscarriage. My last one was a blighted ovum in February.

What did everything do differently?