Could I be pregnant?

I had unprotected sex , on October the 19 and the same day I used the after morning pill. My period was supposed to start in 4 days after that , but it came after 6 days , and the weird thing is that ot was a light spotting or light flow that it lasted for 3 days. My next period was supposed to start November the 26 , I'm late 2 days. I will take a test this weekend, but what do you think, could I be pregnant?