Baths during pregnancy are harmful?

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Okay so this is my first pregnancy and I always heard you can’t take hot baths but was under the impression that lukewarm baths are okay. My stepmom was talking to my boyfriend and he told her I was in the bath and then she literally called me screaming at me to get out of the bath because I was gonna “kill my baby”. I guess my question is are baths okay or not? I’m super sick and the only thing making me feel better is baths. 😫 (if it makes a difference I’m 7 weeks 4 days)