Can someone help me out

Amari

My period started August 9th my cycle came off on the 13th I had unprotected sex & took a plan B August 15 my cycle came back on August 21st & came off on August 25th ! I also been having unprotected sex and my calendar say I’m due for my Period but I’m not having any symptoms could I be pregnant ? Or maybe my cycle is changing from the Plan B ? I need help