i see you are getting all kind of diffrent responses. The first thing you need to do is go get a blood test and find out if you are pregnant. You can go to planned parenthood or many other pregnancy test centers and they will do an exam and everything for free. Then you will be able to make a better decision. Second, How old is your fiance? How long have you been together? Is he financially stable or have his own place? Don't jump into anything just because you might be pregnant, and this day in age you don't have to get married just because your having a baby. Make sure if you do get married it's because you want to spend the rest of your life with that person. If i were you i would wait on getting married atleast until you've considered all the facts and conscequences of each. Third, are you still in school? It is possible to have a baby and still finish high school and go to college but you will need the support from your parents and everyone around you. My advice for you telling your parents is.....they won't kill you i promise! maybe a little disappointed at your decisions but most likely they will help you make a better decision and help you in any way they can. They might just surprise you. Give them a chance. You can talk to them one at a time or together whichever your most comfortable with. And i would sit them down alone without your fiance that way they can be openly honest with you without possibly embarassing you.
Most importantly, If you are not pregnant you need to go to the dr. or planned parenthood and consider birth control and also start using protection. You are very young to be going through this. Let this be a lesson to you & always use a condom they are not to just prevent pregnancy they also prevent you from getting an STD and i assure that is not something you ever want to have to deal with at any age. And guys don't always know if they are carrying an STD and if they do they might not always tell you. If you aren't going to use a condom ask him to go get tested and you go get tested as well. Its a simple test and it doesn't mean you don't trust each other. You have to take care of your health first and foremost. I am 22 years old and i've been with the same guy for 4 years and just recently found out i have HPV (Human papoloma virus) not spelled right sorry...it's trasmitted sexually and guys are the carrier but it doesn't affect them so they don't always know they are spreading it. there are many diffrent strains of HPV that put you at high risk for cervical cancer. So always use protection i have given you many reasons to do so. Don't be so careless. If you don't take care of yourself no one will! Best of luck to you.