hi. pada pendapat sy, consult with both ur gynae n physician. they know better. sbb those with hyperthyroid akan palpitation or nadi laju. n in fact babies punya heartbeat lagi laju dari kita org dewasa, range 150 beat per minute. so if mommy tak makn ubat, x dpt control thyroid or symptom, nnti baby pun terkesan.. hope everything goes well, sihat mommy n baby. take care mommy ❤