condom broke last night and she took plan b im freaking out will she be okay?using a throwaway

hey guys idk if this the right place to post but i need a real adults advice or professional i really need help im m17cree andusing a throwaway bc my friends know my main. last night me and my gf f17 were having sex and the condom broke. i panicked so hard because my parents will actually kill me if i get a girl pregnant like im so scared.we wlaked stright to pharmacy and got plan b right away and she took it walking back but the guy at the counter said it messes with her hormons and causes bad cramps and stuff. i looked it up on google but google is not real people and it just kept telling me scary medical stuff so now im terrified i ruined her body.i snuck back in to her room and tucked her in blanket and gingerale at store i gave her she fell asleep pretty fast but guys im so stressed i couldnt even slep i stayed up until 5am playing her xbox with my headphones off just watching her out of the corner of my eye. every time she moved or sighed i freaked out thinking she was in pain or kept asking if she needed water. she woke up once and laughed at me and told me to go to sleep but i couldn i was so worriedt.this morning i asked her if she need help towalk to the bathroom cuz i thought she would faint from the hormones and she told me to calm down.did i break her body with that pill? how long does it take to work? i does it actually stop a baby from coming or idk what the fuck ill do im just so scared and guilty please help. Like does plan b hurt my girl in a way we are not told??