Retinol Ester and Pregnancy?

hii i've been using antiaging product with retinol ester and i'm trying to get pregnant actually i used infertility drugs this cycle and if it doesn't work i'll do IUI next cycle ...if i didn't get pregnant this cycle for how long shall i stop the cream before having IUI and if i get pregnant is it harmful to the fetus ( i already stopped the cream 10 days before the expected date of my menses)

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