TTC for almost two years?

I am 26 ttc #1 for about two years.I had blood work done last month everything came back normal except thyroid function is low (tsh high) put on synthroid 25mcg rechecked last week now up to 50mcg 1x a day one hour before breakfast prenatal gummys in the night before bed metformin 500 mg 1x a day before lunch (sounds like a very low dose of Metformin to me) I want to get a Hysterosalpingography just to make sure everything is ok I think I want to try clomid what are your thoughts any anything I should add to my meds (vitamins or herbs)