I was given uti medication on a Saturday 9/21 and finished my meds on 9/25 . I'm on cryselle birthcontrol and I had protected sex 3days after my uti medication was done and the condom ripped so that Saturday 9/28 I took a plan b pill because I am not sure if my birth control is working normally. Today is 10/1 an i start my 3 week of active pills but I had unprotected sex and now I'm worried if I don't take another plan b pill I will become pregnant. So I suppose I have 2 questions of which would be do I need a plan b pill again? And is my birth control working normally being that I've been off my uti medication for 6 days?