Tastings after miscarriage

Amanda • I`m 32. Ttc baby #1. I had a chemical pregnancy in August and a chemical again in February. Praying for my rainbow baby
So I'm 32. We got pregnant after two months of trying in July, but miscarried in August. We waited two months to clear my system. And now we're officially trying. This is my second cycle of trying and I'm very sure I'm out this month. So my question is.. When should I ask my doctor to run basic testings?