I hope you are not actually wanting to be pregnant, because the reality of parenthood is MUCH, MUCH, MUCH more difficult than the idea. I am a mom of three and had my first at 18, which was definitely too young. You are 16 and have your life ahead of you. Please don't take it the wrong way, but you haven't even really gotten to know yourself yet, and although I'm sure you feel mature, and may think you're ready for parenthood, you definitely aren't. How do you think you will be able to financially support yourselves, finish school and then get through college while trying to juggle raising a child? Yes, parenting has its rewards, but it is a full time job that is full of discipline and is downright EXHAUSTING, even on a good day! Parenting will complicate your life and put so much stress into your relationship that it probably won't last! I know you don't want to hear this and probably won't believe me, but trust me, having a baby will cause you and your boyfriend to fight more. Guys usually take a much longer time to become emotionally mature, so your boyfriend would likely end up NOT pulling his weight when it comes to child-rearing, and you will end up at home with the kid while he's out and about having fun with his friends . Plus you'll end up missing out on the most fun years of your life, and you'll get "left out of the loop" with friends, since you'll be tied down with a child. Having a child at a young age just sets you up for a hard life. You should first finish high school, go to college, start a career, have freedom to be spontaneous, maybe travel and see the world a bit and get to know yourself. Then after you've lived more and learned more, you can start thinking of settling down and starting a family. You'll be wiser then, and have some financial security. If you wait you'll be starting from a much better and easier place than if you started a family as a teen.
If you are unsure about your results, take a home pregnancy test, but please start practicing SAFE sex and use contraception!