I don't think you are pregnant, but I don't think you should ever have sex without birth control unless you plan on becoming pregnant.
Please visit somewhere like planned parenthood. They offer .F.R.E.E birth control and free pregnancy tests. No one tells your parents anything and you have the knowledge that you are safe from pregnancy.
Also, be good to yourself and make your boyfriend wear a condom
every time. There are a lot of nasty, icky diseases out there that you don't want and you wouldn't even know he had just by looking. The good news is, those are free at planned parenthood too! ;)
good luck.