To test or not to test?

Rachel
I started taking birth control about 2 1/2 weeks ago. I am on a birth control where I will only have a period every 3 months. I didn't wait til my next period to start taking them it was about a week after my last period when I started. My boyfriend and I have been using the pull out method (most of the time 😬) and we have sex almost every day. I would have normally started my period last week (I had no spotting or anything) but due to the type of BC I shouldn't have a period for a few more months. I don't think I am pregnant, I don't have any symptoms. Although I have felt nauseous a few times but I have been under a lot of stress. Am I worrying too much? Should I take a pregnancy test to make sure I'm not pregnant?