I am pregnant, should i take my thyroid medicine?

I am suffering of thyroid, for two years i used Lovethyroxin and for one year i used Thyroxine but it is about 3 months i stopped medicine as the range was normal. but now i become two month pregnant , and i feel that my thyroid has also become bigger, i feel fever along headche and horrible stomach problems such as acid ect, now i tested for thyroid in one result, my FT3 is 4.60 Pg/ml, FT4 0.926 ng/dL and TSH 25.0 uIU/mL and the second test show: T4 3.98 ug/dl, T3 36.4nmol/l , TSH 20.57 mlu/ml, now i dont know should i use medicne, if yes, what will it effect my baby? your answers and suggestions are highly appreciated.