If you use a condom every time you have sex, it has a 98% theoretical effectiveness rate of preventing pregnancy. Since people do make mistakes and do not use a condom properly, the effectiveness rate of condoms is around 82%.
No, as you described the dates, pregnancy is not possible. It's only that because of stress your periods are delayed. Otherwise also Whatever is your cycle days plus minus seven days is absolutely normal. Like in your case your cycle is of 28 days, so your periods can come between 21 days (28-7=21) to 35 days (28+7=35). This is considered normal
So do not be tensed, relax.
There is no fixed time in which one bleeds after taking ipill. Sometimes unexpected bleeding occurs more over it is not necessary. Next menstrual cycle can be early or delayed as side effects of the pill. As she has taken within 24 hrs it is 95% effective
Since i-pill is an authorized emergency contraception measure; therefore it has no long-term or fatal consequence. Nausea, breast tenderness, delayed menstruation, lower abdominal ache, headache, vomiting and irregular menstruation are some of the temporary side-effects of the I -pill. However, these effects subside within a day or two.