Many women who are pregnant or nursing find a sudden increase in unwanted hair. It's fine to deal with this mechanically (like shaving or tweezing), but if you plan to try any method that uses chemicals or energy, it is very important you discuss the matter with your physician.
The following methods have not been determined to be safe for use on women who are preganant or nursing, and are methods you should discuss with your physician:
Vaniqa topical cream
Microwave hair removal*
Transdermal hair removal*
Transcutaneous hair removal*
* these methods have not been proven to work as claimed, and should be avoided even if you aren't pregnant or nursing.