Weight gain and irregular periods

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Hello! So over the past two years after my daughters birth and lockdowns, Iv gained lots of weight. I’m now 200 lbs and my period is late every month. Almost like an extra month of waiting for it but a normal period when it happens (5 days and not terribly heavy) I’m wondering if it’s the weight gain and would like to know if any other ladies have this issue and 200 or above lbs ? I’m worried and have been to the doctors multiple times now. But nothing has come of it, they did bloods and thought a thyroid problem but then my second blood test didn’t red flag anything 😫

I’d prefer it to just be weight gain rather than something serious. Thank you!