5 days late and uber sick! :(

Emily • 24, married, CNA and teacher at an extended care after school program
So my period is 5 days late as of today. I have been so sick I can barely stand it with extreme pain in my left side. I went to the er last night they did urine/blood work and a ct scan said nothing was showing up in the wrong. If I'm not better by tomorrow to come back. I'm not quite sure what is going on but I feel terrible. Anyone else ever been through anything like this? I'm just at a loss. :( My boyfriend and I have not been as careful as we should be considering I was on antibiotics and it canceled my bc anyways but I'm also afraid to take it right now because of not knowing exactly what's going on. Kinda thinking maybe I need an ultrasound done.