Pregnancy TsH level

Megan • Trying for our third! First baby a miscarriage, chemical then rainbow. Second baby 9 months of trying 4 with clomid. Hoping for a quick easy pregnancy for #3

I just confirmed my pregnancy not quite 4 weeks and my TSH did not rise. I find this interesting because with my other 2 pregnancy’s it rose right away. Has any one else had TSH not rise right away?