I've merged your two threads together to keep any replies in one place. From what you've said you were unsure about having sex with your girlfriend but she has insisted and you're now unsure about what to do. If she forced you in a physical sense then it's really important that you talk to someone - an adult that you trust - if you want to tell us a bit more about that then we're here to help in any way we can.
Both the emergency pill and the IUD are available freely from a doctor at your local surgery, sexual health clinic, GUM centre or Brook Centre. If you're over 16, the emergency pill is also available over the counter from selected chemists. It costs around £25. In every case, it's vital that you seek help fast to keep your options open.
Ideally sex shouldn't be a rushed decision. It's easy to get carried away sometimes but you certainly shouldn't feel pressured in any way and it should be a decision you make together with your girlfriend.
I know it's happened now but there's plenty of good advice in these articles to help you in your relationship going forward and in making sure you are doing what you want to do.
There's quite a lot to take in here so take your time to have a read and let us know how things are going. If you'd like any further support do keep posting. Alternatively AskBrook offer a confidential text, email and helpline that you could try
"The greater the problems you've survived, the richer your hidden history of achievement is likely to be."