I took plan B on july 12th while also being on birth control. I didn't know if he came inside of me so to be safe, i took plan B even though i am on birth control. He did come inside of me last week but i didn't take plan B because i had been on time takeing my birth control and i wasn't in my fertile stage so i was fine with not taking it. i just started my last week on my birth control so i was supposed to start my period on sunday technically but it's tuesday and i'm late. Is this usual since i took plan B? Or no because it's been 2 1/2 weeks since i took it?