violent pregnancy dreams

so my younger sister (who is 17) has been having issues with a friend of hers we'll call her Ann (she is 18) . anytime my sis gets into a relationship with anyone Ann freaks the fuck out and tries to control her (even tool my sisters ex.) my sister is forgiving so I try and stay out of it. I could tell her to cut Ann out until I'm blue in the face but it's her decision. but Ann loves to make rude posts about my sister on Facebook and I told her to quit her shit or she wouldn't like the result. her response wasn' and Zoe what can you do? you can't fight while pregnant' (I never stated anything of a violent nature I meant a harassment report but she assumed) any ways I've lately been having horrible dreams of where I physically beat this poor girl to a pulp. almost to nightmare style dreams. I would in no way hurt this girl unless it was in self defense. she is also younger than me and we we're in girl scouts together.. is this normal?