Since Footlogix products penetrate into the layers of the epidermis and not into the blood stream, the products are safe.
However, because of the active ingredients present in the anti-fungal formulas (Peeling Skin, Rough Skin and Anti-fungal Tincture), we would suggest your client to get a doctor's approval before using them.
If the client is coming to you for a pedicure in her first trimester, a suggestion would be to not use the Exfoliating Seaweed Scrub and the Massage Formula. However, the massage formula is not a problem as long as the massage technique used is light effleurage only. (that’s with any massage product).