Talk to Gynecologist on Gynae Problem. Need To Know About Just Info Regarding Medicine.

My doctor prescribed me 6 months of clomid 150mg. I took clomid 100mg (just want to start from lower dose),took for 3 cycles . First 2 months, I ovulated and periods were normal but no pregnancy. But in the 3rd month my periods were late about 15 days at the same 100mg dose. I didn’t get pregnant bcz I didn’t know at that time that my thyroid level was not normal. Now after 2 months of taking medicine my thyroid level is normal. My question is should I take that same dose 100mg?for my 4th cycle Or should I take 150mg ?Bcz that 100mg not worked in my 3rd round? I can’t contact my doctor bcz m out of country also due to guide.