During the first 18 weeks of pregnancy the foetus is dependent on maternal
thyroid hormone . If the mother is having hypothyroidism and is on replacement of levothyroxine the Dose of levothyroxine is often increased durning pregnancy . You should have never stopped taking levothyroxine tablets without consulting your doctor.
Next Steps
You should immediately start taking the the levothyroxine tablets the same dose . Since you stopped it during 5th month There is no need to worry much as by then the Foetus starts making it’s own
thyroid hormone .
But this should Not be done next time .