Female Guppy Behaviour

I just got guppies this weekend (2 males, 4 females). The males are very energetic but all of the females just hide behind rocks or in plants near the bottom of the tank. Is this typical behaviour for female guppies? I suspect one might be pregnant and she won't even come out to eat. The tank is 10 gallons and there's only the 6 guppies in there.

If she is ready to give birth then yes this is normal behaviour.

They still might be stressed a bit. What do you plan on doing with fry? A ten gallon will get overstocked very quickly.  
If you could post some photos I may be able to tell you if they will drop soon.  

I have another 10 gallon that I've been cycling in preparation of babies since its bound to happen with guppies and then I'm hoping I can give some away as they produce more. Or I'll get another tank and keep the males and females separate so I don't get anymore babies. I will try and take pictures when I get off work but since one in particular doesn't come out of hiding it may be hard. Thanks for the help so far.
And it's not just the suspected pregnant one that's hiding. All of the females are doing it but three of the four still come out to eat. Is that typical or could they be pregnant too? The Gracie spot on three of them isn't very dark at all. They are all quite large though.

Well female guppies are almost always pregnant if they have been around males. Females don't always have a gravid spot, I have had females who have never gotten a darker" gravid spot". Do you notice anything on the fish that is out of the ordinary?

It's hard to tell how far along they are if you only got them at the weekend ... So a pic would be great.

And if they are stressed you can turn the light off for longer during the day so they can get used to their surroundings and ease them into their new tank, also when you feed them just drop the food in and leave, watch them from a distance, they are probably scared, thinking is he going to capture me and stick me in a bag to another weird environment?!
You could also do a water change and see if that makes a difference as that many fish in a new tank adds to the bioload instantly.

i cant figure out how to add photos

I think I've figured it out.
The two pictures of the fish with the dark gravid spot are the same fish. The first two pictures are two different fish and there's one more but I couldn't get a picture of her because she was very skittish. But she doesn't seem to be pregnant.

The first female probably dropped a week or so before you got them, unless they haven't been with males. The last female is pregnant but I would give her at least two weeks.