I am so hungry lately!

I know for a fact it's way to early to have pregnancy symptoms but I have been so hungry lately. At this rate I will be sure to pick up on the pounds pregnant or not! As soon as I eat it's like where did the food go. I wake up nauseated but as soon as the day goes on I am starving and finishing all my food. I am never like that. I usually never finish meals and get full fast. Now I seem to want seconds. Not saying its possible I am pregnant but was curious has anyone have similar situations as soon as conception and later tested positive?