17 weeks pregnant. have shellac on nail as told it was safe. they soak your finger in pure acetone for 10-15min to remove shellac , done 2x. baby ok?

Yes.: The risk of any real exposure to the baby is quite low.

Probably: Given the type of exposure you describe, there would be little, if any, absorption. The general rule of thumb in pregnancy, however, is avoid as a many toxins as possible. Congratulations!

General rules: The stuff you apply to the skin surface will not achieve a significant level in your blood & thus not effect the baby. Many draw the line at perms or other such events where toxic substances sit on a wide surface for extended periods, but the usual creams,lotions or other skin care you encounter will not be a problem.