New job..When should I tell my boss?

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I just accepted a new and stressful job and BAM, I found out I'm pregnant! 😱

One, I've only met my supervisor once who didn't seem very nice. Two, I'm not exactly sure WHO I should tell and three, they've already let go of two girls since I've been there for one week.

If you ladies were me, when would you tell them? I almost feel like running back to my old terrible job since I'm scared 😩

Any feedback?