When to see Dr.

So just got my period again today 😭. Long story short, I had a missed miscarriage (triplets) at the end of July. It took over two months to get my period back and ever since it seems to be shorter than it had ever been before and I’ve been spotting more between periods. I’m worried my luteal phase might be too short/have low progesterone. We’ve only been trying for 4 months since the miscarriage but I’ll be 35 in a couple months so feel like I’m running out of time. Would you contact your obgyn now or wait a couple more cycles?