My thyroid is off a little, my period is off this could be why

Idk what to do I go to the Obygn they tell me your Thyroid is off a little but this could cause irregular periods and why ur prob not fertile and now my husband telling me oh no we have to be careful u don't get pregnant we need to be ready I'm 33 he's 30 he has no kids I had mine at 19 and 21 with no helpful daddy. Now he supports me and my kids but we  well he's not ready now I'm so upset been married since October 2015