i went to dentist when i was 4 mths pregnant. should be ok but must tell dentist that you're preggie and make sure the filling that he/she gives is safe for you and baby.
i read that it's not advisable to go dentist when pregnant coz our gums are super sensitive at this time. i bled a lot when my dentist was cleaning my teeth. i dont't usually bleed so much when i was not preggers.