I drank ethinyl estradiol levonorgestrel as emergency contraceptives last week. As said, I took the medicine within 72 hours after sex, though, it only said I should take 2 dosages of 4 pills (12 hours in between, but I also took another 2 dosages with the same method the day after. I don't think I overdosed to any extent though. My worry is that, does it make it less effective? And why haven't I got any of the withdrawal bleeding yet? Can it cause delays of period as well? And am I save from pregnancy? Thank you ,please answer.