It is true that a drop in temperature, will warn you of the coming birth, but with not knowing the actual date of conception I would not temp her every day, cats can look like impending birth for two or more week before they acutely go into labor,
If she is anything like the cats I have fostered in my home in the past she will let you know. I have listed a link
Pregnancy - Birth - Newborn Care There is one link called
Queening (giving birth)There is a spot in it which is called stages of labor, in this section you will find all you need to know pertaining to your cat and birthing. I hope this is helpful to you.