Freaking out.

Ok so life has been stressful lately. I haven't been sleeping great. Also, im not one to keep track of my periods real great either. I think it was like about a week ago it ended but it deffinitely lasted a good couple weeks. Anywho I came down with a uti like two days ago and felt super nauseous. I went to the store bought Azo and the frequent urination stopped but the nausea has stayed the same.. not sure if its related to the uti, my lack of sleep and the abundance of coffee I've been drinking or that i could be pregnant. I have the copper iud, but we don't use protection. Not sure what to think.