Some say can use up to 5 days after intercourse but success rate will decrease significantly after the 3rd day. You can try.

Hard to say safe period or not as different girl different menstrual cycle and not everyone has a stable cycle.

Doesn't sound like anything wrong to me. Seems normal. Everyone react to the pill differently. As long as she is not bleeding abnormally and really in pain that is significantly different from the usual period cramps, then you shouldn't have anything to worry about.

Get pregnancy test kits and test 2 weeks from now. In the mean time, you guys should keep your stress levels low and not mess up her cycle again. If you guys are really worried, go ask a pharmacist for their advice or see a gynae to clear your doubts.

still got ppl call u bro. haha.
Think you need to change ur avatar back to the previous one.
Well she rage only during period la...then u rage later at her lo. So win win situation.
When u rage u tell her why u rage la....but this time rage safely. LOL!!
My advise, is get a calendar. You will know when she is having her period then you can avoid confrontation with her.
But the calendar works providing she has a stable period.

Just be patient bro. At time like how u are sensitive, they are like tat when having PMS. If you dont want apps to keep track scared ur friends see it, try this website: yourdays.com. Or another way of knowing is getting her to tell u when she is getting her period. Usually for those with unstable periods, calendar cant help much.

I find it helpful. And also I find out talking to her about her rage helps. then you can know what to help her. Some of them have pain, some have uncomfortable feeling when they flush out. Had my share of rage, so now things are better. Communication and also some helpful tips from my girl herself.