You can eat them, but make sure they are fully cooked and from a clean place. Also, do keep up with your regular doctor visits and thyroid tests, health checkups should never be missed.
There is no harm in having veg momos as long as the cabbage and veggies are properly washed and steamed well. Try to avoid street-side ones to prevent stomach infections, okay? Take care.
Actually, I craved momos so much in my second trimester, yaar! Just eat from a good cafe where they cook it properly. Street wallas sometimes use bad water for chutney.