Thank you for both of your replies :)
i have just actually realised what I have put after being confused y u said about a blood test,lol..I havent had one done, just hpt, n they hvae been negative..I will definately wait until next period and see what happens, im just a bit worried incase I have the sometimes normal '3 periods ' in the first trimester and have ran out of time for decisions I could make, I am only 17 and I know I should have been more responsible..But silly things happen unfortunately, but I will let use no how it goes, thnx again for the prompt replies, its much appreciated :) xxx