Sex while spotting

Patient: My boyfriend & I had unprotected sex a couple of weeks ago & I took the Plan B pill. This week I started earlier than Feb. 28th(the time I was supposed to start). On Feb. 24 & 25 I began to spot. However, on the 24th I had unprotected sex but didn’t take the Plan B pill because on the 26th my period began to flow regularly. Is there a chance I’m pregnant?