Pregnancy Scare or UTI

Ok so I never post on here but like I’m kinda worried. So me and my partner had sex on Monday we used a condoms didn’t break or anything. I’m on the pill and I take it every day the same time but when we were having sex I was on the placebo pills and i took the first one on Sunday. Had my period on Tuesday but it was short usually mine last for 5 days. After my period I’ve been feeling funny my stomach has been doing flips and this weekend been urinating a lot. It was my first time having sex I’m 22 and in college. Not sure if I’m pregnant or a uti. Should I take a test and/or make an appointment?