I've been on it since I was in 18 it's nothing to be worried about
I have hypothyroidism found out before I was pregnant with my first I take levothyroxine 200mg pill every morning as mine is not stable keeps messing up. You need to keep taking your pills as if you don't things can go wrong with pregnancy i am on extra scans to check the growth of baby cause baby can be to small or too big.
I had hypothyroidism with my 1st pregnancy that I took 50mg of levothyroxin for everyday from early on and my son is 2yrs old and very smart healthy and everyone says he's incredibly well behaved. Im on it again for this pregnancy and had to have the dosage upped a few months ago as far as I know my 2nd boy is good my doc had told me that my thyroid beong low couldve caused a miscarriage I had almpst 8yrs ago and other complications besides the things it can do to u.