Thanks for the query.
Some amount of nausea is common in pregnancy, but as you are having severe nausea
better to take medicines as adviced by your doctor.
is contains of pyridoxine
Pyridoxine belongs to category A and meclizine to category B drugs in pregnancy according to FDA.
So navidoxine can be used as benefits over weigh risks here.
You have to continue levothyroxine
and maintenance of normal thyroid levels is essential.
Usually there may not be any interaction between these drugs.