Hello, I have been really stressful for the last 3 months. Probably because of that, I missed my period last month and have been delayed by 21 days now. No, I am not pregnant - had multiple urine pregnancy tests done :) Yesterday however, I have started a course of Deviry 10mg and I have been told by the doctor that I would get my period from the 11th day after the completion of this 5-day course. Would it be safe to have unprotected sex today but with the withdrawal method? Deviry can prevent pregnancy, right?