Pregnancy Scare

Okay, so my boyfriend thinks I may be pregnant and I honestly have no clue. I started feeling sick in the mornings about two weeks ago and this morning I was completely sick to my stomach, I've been eating like mad and craving random things but I have yet to gain any weight (I'm heavier set and it doesn't take much for me to gain) and my moods have kinda been all over the place. I'm sixteen and talking to my parents or any other adult is completely out of the question. I could really use some help and advice!