When you have unprotected sex, just assume you're trying to get pregnant on purpose. There's really no logic to making the choice to have unprotected sex, then panic afterwards. Be nicer to yourself.
Look into emergency contraception... like Plan B. If you determine that's an option for you, then you need to take it within 72 hours in order for it to be effective. You can get it at most pharmacies/drug stores in the US without a prescription.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CFAQFjAA&url=http%3A%2F%2Fwww.planbonestep.com%2F&ei=GLROT_eMOZD-sQKv3KkK&usg=AFQjCNFBy9sz8jwpItgeegNl055jROkMWg
The fluid on the couch could be seminal fluid or vaginal fluid. You'd need to examine it under a microscope to be sure...
Learn more about your body:
beautifulcervix.com
http://tcoyf.org/
Answered Feb 29, 2012
Edited Feb 29, 2012