Hi I have an irregular period from 28 day turned 35, last menstrual period was Feb 15-21. According to my app, ovulation is on mar8. Had sex on mar3, after 17hrs took ECP Nordette 4 pills @mar4 12:40pm, 4 pills again mar5 12:40am. Experienced side effects are nausea, headaches, low grade fever, today is 4th day, im scared.. what are the chances I m pregnant?