What Causes Light Pink Spotting After Period After Unprotected Sex?

Just wondering if I could be pregnant. I had unprotected sex twice 2 days before my period. My period came, but was much lighter than usual and didn t last nearly as long. 2 days after my period completely ended and I had light pink spotting. Also it s been a week and a half since my period and my back has been hurting, I ve felt dizzy, and urinated a lot more and have read that it s a little early for symptoms but has happened. I know that it s really unlikely to get pregnant at that point in your cycle and even more unlikely to get your period afterwards. But is it possible? Thanks in advance :)