Worried about unwanted pregnancy

Patient: Hello. I had sex about 4 weeks ago and I used a condom. I am just worried though because I had forgotten to take my pill that day and the day after but I started my period on time and normal the week after. I was still nervous because I heard you can still get a period when your pregnant so I took a test 3 weeks later and it was negative. Should I still be worried?

Doctor: