I had sex a day after my period finished took Plan B within 24hrs. A week after I started getting breast tenderness and started to bleed but only for a day and a half but not spitting was enough for a pad. After nothing simple cramping and now I’ve been using the restroom every hour

Could I be pregnant I’m just super paranoid? My boobs have only hurt when pregnant, but I think I can’t be. I took Plan B and it was right after my period