Am I pregnant please help??!!

About a week ago I had unprotected sex which is normal because me and my boyfriend use the "pull out" method. And the day after I started taking the birth control pill. Today I found out I have a uti and I've been sick all day with chills and nausea and obviously I'm peeing all the time. My last period started august 23rd. I don't want to be pregnant and I don't think I am I just need some reassurance that I'm ok