Pregnant: no to sex, but is it ok to masturbate?

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Hi, i hope you could help me. I'm very horny and can't have sex with my partner since my doctor told me that my 4 mons. baby's placement is low.

But I was thinking if It's ok to do a light masturbating outside the vagina? Will orgasm affect my baby?

Hope there's someone out here that experienced this before and can help. Thanks!