Hypothyroidism, pregnancy, res raspberry leaf tea

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Well I was on birth control for 8 years and have been off now for 14 months. 6 months after getting off, my cycle was going on day 40 without period and negative pregnancy test. Turned out I have a hypothyroid. We are 8 months into trying for baby #2 and it still hasn’t happened.... I’ve started drinking RRLT in hopes it would build up my uterus better because my periods have been very brown.... I’m assuming my uterus is thin. Uggg anyone have suggestions on what vitamins and herbs I should be taking?