B.C.
I was hypothyroid before I was pregnant and I was on synthroid.
The only thing the fertility specialist recommended with regard to it was to slightly increase my dosage, which was done.
It's better to find out soon as possible and take your thyroid med regularly - through your pregnancy and beyond.
You and the baby should be fine.
Just remember that taking your med is GOOD thing and they should be monitoring you for changes in your dosage throughout your pregnancy.
http://www.medicinenet.com/hypothyroidism_during_pregnanc...