emergency contraception
"Had unprotected sex around 11PM and took the pill at 10AM the next day. I live in the UK so I got it for free from the local NHS walk-in centre. After taking the pill I experienced some depression, apathy and was sleepy for the next 4-5 days to the point where I would sleep for 13 hours and still feel tired. 5 days after taking the pill I experienced light spotting. I also felt nauseous from time to time 2-3 weeks after. Got my period 6 days late. Was totally freaking out before that so did home pregnancy tests and went to see my GP. He said it's normal to have delayed menstruation or even skip a month after taking the pill. Do a home pregnancy test if you're anxious.They are 99% accurate if taken 3 weeks after last unprotected sex."