Advice

so i need some help y'all. my boyfriend has been home for 10 days & we've had sex every day since he's been home (he's in the marines & goes back tomorrow at 6 am) But anyway, i've been throwing up since last monday, i haven't missed my period yet but i have gained wright & everyone says i look pregnant. I took a test & it was negative but i'm pretty sure i took it to early since my period isn't supposed to come until Thursday.. i just need advice because i'm freaking out. He's perfectly fine w/ a baby & ive talked to my mom about it and she's supportive but i'm scared ...