pregnant at 16?

my boyfriend and i had sex without a condom for like two minutes and decided it wasn’t a good idea, a week ago. he didn’t cum in me but I’ve been feeling naseous and very hot the last two days and almost a cramp pain and the lower stomach feeling tight. what does this mean, what should i do? my mom doesn’t know I’ve been having sex and I’m so scared that I am and my life is gonna be ruined and so is his