And while there have been no controlled studies looking at the safety of acrylic nails in pregnant women, think about how many chemicals are involved in applying, maintenance and removing artificial nails. You probably do not want baby exposed to all that chemicals.
Of course it is best to hold off on artificial nails until after the baby is born. Even after that, you may find that caring for your baby is much easier without long nails.
In the meantime, stick to the naturally buffed look or use a DBP-free, formaldehyde-free polish. There is a big number of them on the market! If you want to make a pedicure in a salon, ask for a seat in a well-ventilated area, and if the fumes make you feel nauseated, definitely go outside.