if you would have thought about it at the time, she could have gotten a prescription from her doctor for the 72 hour pill. but it sounds like youre past that point. doesnt sound like anything will happen. she could be psyching herself out. stress, diet, sleep patterns - tons of things can throw off a woman's cycle and make her late. so if she is scared about it, it could be stressing her out to the point of making her late. drug store pregnancy tests can only do 5 days after the missed period at the fastest. you could always go down to the hospital and have them do a blood test. that will be more accurate and available sooner. good luck.