Could I be pregnant?

I am 24 years old, I have regular periods, I track my period and the symptoms I experience associated with it. I typically have a 23–24 day cycle, I typically ovulate on the 10th or 11th day of my cycle. I am on day 33, my period is 8 days late. I had unprotected sex late at night on the 12th day of my cycle (early morning of the 13th) I am experiencing fatigue, nausea and vomiting, headaches, extremely tender breasts. I took an at home test when I was 6 days late, it was negative, and my tracking app said I was late but still within the normal. Today it says that I have been late for a long period of time, as time goes on I am getting more worried about this situation. I don’t know if I should buy another test or if I should just go to the doctors. Also if you have any ideas on why else I have missed my period please share