So Hungry!!

Hey Mommas! I am 6 weeks and so far not experiencing too many symptoms other than I am SO hungry all the time. I eat, and then about an hour later my stomach is GROWLING. Within the last week I've started to experience nausea, but only when I haven't eaten for an hour or so. I've been getting really nauseous at night, I think because it's so much time in between meals. Then during the the day, after about an hour in between snacks/ meals I start to get crazy nauseaous. Once I eat, I feel fine. Is this normal?! I don't really want to be eating every hour! Could I be having twins, or am I deficient on some sort of vitamin? Anyone else experiencing this?