Bath , taking and sleeping problem

Okay so I am 12 weeks pregnant and I was wondering is it okay for women to be in their first trimester still to take a bath cuz I don't want to cause harm to me and my child also lately it's been really hard for me to sleep at night because when I found out that my child was on my left side I decided to lay on my right side but when I lay on my back nothing happens but I'm too scared to lay on my back or my left side anymore because I feel like I'll harm my child