smoking weed while pregnant!

ladies, I know this girl that smokes weed during her pregnancy for 'anxiety' issues & she said it has helped her calm down. she also said that she only smokes 1 puff and it helps calm her down when she's really stressed. my question is, has anyone smoked weed around weeks 13-16 & everything be okay? I'm not asking for myself in asking because I'm concerned for her baby.