Late period- Help!

Ok I'm normally very regular with my period. This month I spotted once 4 days before my expected period date and again two days later. Both encounters only once when I went to the bathroom. TMI after the first time spotting I had sex with my boyfriend since the spotting stopped. Normally this will bring my period down but it hasn't this time. I'm three days late and worried I could be pregnant. I'm going to wait to take a test. Any advice or stories? Maybe I'm overthinking it.