When I wake up in the mornings I always feel like i have to throw up, im really hungry. Is it because its been so long since ive eaten?

I usually walk outside and gagging until i get some water and breakfast. On some mornings i do throw up yellow bile and it makes me feel better and then i can eat straight after. Im 12 weeks pregnant just wondering how long this will lasts as it takes me an hour from when i wake up and eat before i feel better or well enough to get up and do anything.