hi welcome to hcm.see u should deteriorate ur plus ur fetus health by discontinuing thyroid
tab plus smoking which may produce birth defect
into ur fetus.see u have to concern gynec go for sonography
to see the development of ur child,as per ur doc advice further do acc that.don't be too much stressed because whatever u do during pregnancy
it affect your fetus growth so be cheerful and happy.birth defect like mental retardation,any kind of physical defect,respi problem etc.so immediately advice ur gynec do complete check up and avoid smoking must.