I had unprotected sex two months ago had my period the next morning but still plan b.My tubes are also tied. Had a period last month an now I'm two days late. Went to the Dr. fir pain in lower stomach an pelvic he done a urine test an it was negative so he then done a CT scan an told me I had a uti. But I'm two days late an worried could I be pregnant or is stress making my period late? Please help.