Bird always wanted me right there with her, next to the box where she was going to have the kittens, and complained quite loudly and chased me down whenever I would get up to go to the bathroom. When Meggie went into labor with her kitten, she came hollering at the window for us to come back in the house and sit with her (I let my DH do the honors this time, as she likes him the best
). She may just want you there, but if you are in doubt, call the vet
. I'm sure your call won't be the first one they've gotten from the mom of a pregnant cat
Edit: just read the part about looking like she's pushing- I've never seen a cat do that on her back- but sounds like labor! Will she let you put your hand on her tummy? You should be able to feel when she has a contraction
. Prayers going up for healthy kittens and a safe delivery!