Pregnancy symptoms or irrational thoughts?

Well, the mind is a very powerful thing. You obviously are stressed out and so therefore everything will seem magnified. Firstly, why didn't you go to the GP or the free clinic (called the GUM clinic in Scotland) to get a morning after pill? Secondly, you can't take a pregnancy test until it's been at least a week past when your period was due to start, and some are even longer than that. You can also get a pregnancy test at the clinic and at the GP, I believe, as long as you are 16 you can go by yourself without parental consent. Other than that, there is not much advise to give you. Anytime you have sexual intercourse without protection, whether or not the guy ejaculates inside you or not, you increase your chances of getting pregnant. You can't change the past, you can only learn from it. From now on, use birth control. You can also contact the NHS helpline, and use their web page for help too.