Should I test or no?

I have anxiety so I can scared over pregnancy. the last time I had sex was Aug. 6. we don't use condoms, he pulled out and I've been on combination birth control pills for 1 year. I take them perfectly at the same time everyday. I had tender breasts and felt a bit nauseous for a couple weeks however it went away (I think I was just getting sick). I got my normal withdrawl bleed on Aug. 28. It lasted for the the same amount of time that it normally does with a medium flow. I keep telling myself I shouldn't worry but I just wanted another opinion on if I should take a test or if I'm totally fine. thank you :)