Is it normal to be so hungry?

Claudia
Hi guys,
I recently found out that I'm pregnant (at 4 weeks, 2 days). I have noticed that the last couple of days-- mostly two because that's when I found out about the pregnancy-- that I'm STARVING at night. Like, I can't sleep and it's this deep, almost painful hunger. Is this normal or do you think it might just be psychological? Isn't it too early to be feeling so hungry? 
I eat like a bird to be honest because I'm very small (5'0", 86 pounds at 30 years old) so this ravenous hunger is driving me insane.

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