Am I Safe From Pregnancy If I Took An Emergency Pill 3 Hours After Unprotected Sex, Despite Ongoing Urine Infection And A Low-grade Fever?

I had urine infection when I had unprotected sex 3 days ago. I popped a pill after 3 hours of the intercourse. My period date is 21st of this month. Am i safe? I ve not noticed any spotting till now.. I m quite worried. I am still having urine infection. I didn t go to the doctor as I thought they would do urine test and if HCG comes out then my mom will get to know about it. I am having fever from that day itself. Not very high fever but 99° to 100° everyday like continuous fever. I am very worried please help