There are a number of skin care products which should be safe during pregnancies.
One of the cornerstones of anti-aging regimens, the Retinoids such as Retin A and Tazarac should be avoided.
Nevertheless, there are plenty of good skin care products that can be used during pregnancy. These would include many of the antioxidants. CoffeeBerry (Revaleskin) would be fine. This product has less caffeine in it than a cup of coffee and as long as you use it once a day (preferably their night cream) and do not smear it on your whole body you should be fine. I can see no problem with any of the lines containing pomegranate either. However, stay away from the antioxidant soy since this has estrogenic factors which could cause problems, perhaps to the fetus and more definitely to the skin (intensifying chloasma, the "mask of pregnancy".)
Alpha-hydroxy acids such as glycolic acid are acceptable but do not use Beta hydroxy acids such as salicylic acid. Glycoloic acid peels, performed in a dermatology office, would be fine. Similarly, I can foresee no problems with microdermabrasions, as long as antisepsis is practiced.
Sunscreens, of course, are important as an anti-aging weapon. However, I would stick to the so-called physical sunscreens based on zinc oxide or titanium dioxide.