You did not say what medicine you were prescribed. If it is Eltroxin
50, the treatment used for hypothyroidism
can safely be contemplated as there are no evidenced birth defects. In fact, deficiency of the hormone could lead to pregnancy complications. You should get a serum beta-hCG serial record as well as a trans-vaginal sonogram if possible to see the status of your pregnancy. Meanwhile avoid all stress
including intercourse, take rest and have plenty of fluids. Good luck.