It’s essential you let your aesthetician know if you are pregnant (even if you’re waiting to share the news with friends and family) so they can tailor your treatment and can be avoid any potentially harmful ingredients.
Be particularly careful about your skin treatment during pregnancy. Not only is your body undergoing rapid changes at this time, there is also the possibility of chemicals being absorbed into the skin. Ideally, any treatment you have should be very mild. Also, test for potential adverse reactions before using anything, even for treatments you’ve had in the past as your skin can be unpredictable at this time.