I think my kitty is pregnant!

Hello! My family and I adopted a six month old black (Siamese I think) kitty . She did not come with papers and i was told that she has never been to the vets. I grew up fostering cats and so I've checked her for worms and treated her ear mites, she doesn't have fleas.
This kitty seemed extremely chill to me, sleeping all day besides to drink and eat, drinking and peeing ALOT. Not very playful until in a strange spurt! She will all of a sudden go nuts!Then quickly calms and goes back to sleep after drinking a ton!
This behavior made me wonder, could I have inherited a pregnant queen?!
I have helped cats give birth many times! I was a little girl then though ...I am so confused as to if my kitty is pregnant or not! When we got her a few weeks ago, she was slim, no belly. I noticed her belly getting round just the other day, so I did check out her nipples and belly. Nipples seem to have lost some hair but aren't pink..They seem longer than they should be. When feeling around her belly, I felt very subtle but very real, movement and bubbles. I called the vet and they were booked all weekend and I unfortunately don't have a ride during the week(live out in the middle of nowhere and my husband's car is the only one working, he works from 4 am to 6 pm, trying to find a ride but everyone lives so far) I made her a nesting place in my closet and when I showed it to her she was purring away, rubbing on me, smelling all around. She seems very attached to me ever since.
Very cuddly , just wants to be pet and to sleep. Any suggestions would help! Thanks

She sounds pregnant to me! Feed her unlimited food, and it's good you've made nests for her.

Here are some links that should help:

http://www.thecatsite.com/a/cat-pregnancy

http://www.thecatsite.com/a/how-do-i-know-when-my-cat-will-give-birth

http://www.thecatsite.com/a/pregnant-cat-what-to-prepare-for-the-birth

http://www.thecatsite.com/a/help-my-cat-is-having-kittens

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