Hello!

This is a good question. 

The American Pregnancy Association has this to say about sunless tanning products and pregnancy: 

"The only concern is whether the active ingredient, dihydroxyacetone (DHA), is able to penetrate the skin. Studies do not confirm that it can, but some health care providers encourage women to wait until after the first trimester, just to play it safe. DHA has been used in cosmetics since 1960 and no problems have been reported. Even if you have used sunless tanners before, try a patch of skin first. Your skin may be more sensitive and irritable during pregnancy."

Here is more advice from a doctor on Mom Logic.

It seems that there is a lot of varying precautions about all this so I am thinking your best bet is to ask your gynecologist to be sure. 

Hope this helps some!  Thank you for your question.