Got BFP after having a CT and surgery. Should I be worried?

I had an emergency appendectomy two and a half weeks ago. Before the CT they had me take a pregnancy urine test. I told them it would be way too early to test, and it came back negative. I had the surgery, everything is fine there. But today, with my period 5 days late I got this guy. I’m going to call my dr. Should I even considered this viable?