Dr. Kimberly Butterwick, a member of the American Society for Dermatologic Surgery and a private practitioner in La Jolla, Calif., says that many people think once you stop Botox or filler treatments, the face will suddenly become uneven and droopy, but this is not true.

"Depending on each patient, Botox can last up to four months and will slowly start to loose its effect after that time if it's not properly maintained," Butterwick says.

"Pregnancy adds a natural glow to a woman's skin, and the 'baby weight' gain will make the face fuller -- this extra weight naturally replaces the effects of fillers or Botox in the face by filling in unwanted lines and wrinkles for the duration of the pregnancy."

A month after a woman gives birth, when the effects of fatigue may be most noticeable, and if she is not breastfeeding, it is then safe to resume treatments, Butterwick says.

Because there is no concrete evidence to prove whether Botox is either harmful or safe for the unborn baby physicians won't normally administer fillers to pregnant women.