Some people think that it's not possible, but any type of 'liquid' from the boy can have sperm in it and if you are at the right stage in your ovulation, this could well happen. You should always use condoms, no matter what. Not just to prevent pregnancy but HIV and other diseases. When is your next period due?
You will probably have to wait till it's due and then
see your doctor and/or take a Home Pregnancy Test. You have reason to worry, so from now on please be more careful. I wish you lots of luck.
Check out the following sites to learn a little more since you already are into the experimental stages..
http://www.pregnancyandbaby.com/read/articles/224.htm
http://www.americanpregnancy.org/get...ysymptoms.html
http://www.americanpregnancy.org/dur.../pregcalc.html
And just in case (I hope not because you are too young and it's a lot of responsibility to be a mom): this site will guide you through stages if you are..
http://www.babyfit.com **This one is free to join and has it's own forum. Also covers other questions you might have, diet, exercise, medication and clinical procedures. etc.
P.S. if my answers helped you, please click on the rate this post on the upper right in the blue line, thanks.