[Amazing Yorkies]

You might be on the upswing of the temp cycle. It should go back down and stay down and that's when the babies are supposed to come.
As far as milk goes, most have milk a few days before whelping, but of course others don't get milk until after they whelp. Wish we could be more of definate help, but there really is no rule of thumb for any of them. You will know when it is time, she will make it obvious. Hard to explain now, but you will know.
If it were me, I would set my alarm for every hour or two and check on her.