stressed and scared, looking for advice.

My boyfriend is 19. I’m 16. We have unprotected sex a lot but he always pulls out. I know you can still get pregnant from precum, and all that jazz but i’ve been pretty lucky. Two weeks ago, we ended up having unprotected sex and he came inside of me. For the past three days, I’ve had bad nausea, and bad cramps on and off. My period isnt due until the 25th, When can i take an accurate test? Do you think these might be symptoms of pregnancy? I’ve just had this bad feeling that something isn’t right with my body. My back hurts, I’ve been eating a lot and still hungry, something isn’t right. Please give me any advice/suggestions/anything you have. Thanks so much girls.