Should I take a PT

I had what I would consider a light amount of brown spotting for 3-4 days starting 3 days before my period was supposed to start and then it stoped and my period never did start. I recently switched birth control pills last month and didn't even have a period last month, that my doctor said was normal. I'm just wondering if I should take a PT test or if it's fine. My boyfriend and I had sex 4 days before the sporting started, but we used a condom and I was on the pill but idk.