Research what products they use.... pregnancy should avoid Retinol, Strong concentrations of vitamin A, etc. Inform them you're pregnant... they will know what treatment to avoid (eg. Cannot do those ultrasound wave treatment).
I suggest u try to put coconut oil on face. I had this huge mega pimple that refused to go away when I first got pregnant.... I went to a derm who charge me $200 for consultation and a cream which I wasn't comfy to use... in the end I use coconut oil and it reduced the pimple ....
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