A woman who has thyroid problems can get pregnant.
However when a woman has thyroid problems it can make it more difficult for the woman to get pregnant and conceive.
It's not impossible to get pregnant when you have thyroid problems but it's more difficult if you do have thyroid problems.
Before trying to get pregnant when you have thyroid problems you should work to get the thyroid problems under control.
My sister has thyroid issues and she did get pregnant after the third try so it's possible.
You may also need fertility treatments in some cases if you can't get pregnant with thyroid issues.