Methimazole

Hello does anyone take Methimazole for their overactive thyroid. I am currently 14DPO with no period. I was supposed to start today but have not. I took 2 test [ end of day, not morning ] at 11DPO and BFN. I havnt take another one yet because I wanted to be sure AF wasnt coming. I was on Methimazole for a few months and we stopped trying until my thyroid was in order. It is close now but I am back on my Methimazole religiously now since my dr said my thyroid is still not where it should be. With your tyroid Impacting your cycle I wanted to know if it was "normal" to be late when taking it. I don't think I had an issue last time I took it.