Work conflict

So all day I put up with a co worker that slacks off a lot but I got so angry today that I told her how I felt and how it’s unfair I do 99.9% of the work. And after I got mad at her I got pain in my left rib cage… scared me so I was wondering if that’s something to be concerned about at 16 weeks pregnant. I usually try and stay pretty calm for the baby but I couldn’t hold this back for some reason .. oh and to top it off she goes off and tells people I am bullying her because I have too many hormones rn. Like whatttt no just do your job and don’t blame my pregnancy.