Come on people, if she's pregnant than telling the guy not to fuck her is beyond dumb.
First of all, don't panic. You don't know for sure that she is pregnant. There are other things that can cause these symptoms. I had similar symptoms, including morning sickness, when I was just exhausted and stressed. Remember that you had an accident with the condom, and this will have been playing on her mind, then missing her period will have made her stressed, and this will also play havoc with hormones.
Now, when you get to the test and if she turns out to be pregnant then you need to sit down together and talk through your options. It isn't easy, but if termination is one of your possibilities then it is something you need to get on with early on. I can't help you with the permission thing, but it seems incredible to me, since her parents aren't the ones with the baby. Make sure you know what you want to do talk it over, then sleep on it, and talk it over again. Then she will have to tell her parents. Then you'll have to make sure that her parents know what she and you have decided and make sure you remain calm and clear. Don't mess about and don't get angry if they become difficult, make sure they know that you have thought it through. They might be more willing to listen to you.
The most important thing here is not to panic, and to be there for your girlfriend, because she'll be even more terrified of the prospect than you, and she will need you.