Patient: Could I be pregnant?

Symptoms: I had unprotected sex on Feb 6 and took plan b about 12 hours after. I didn’t have any symptoms after I took it. Now, on feb 17 I had some mild cramps and spotting. Yesterday I was really tired and felt sick all morning. The start date of my last period was Jan 23. Could this still be side effects from the pill or could I be pregnant?