Dog Breeding - Temperature drop in pseudo pregnancy?

I have been breeding for over 25 years but have a question regarding a ***** who has previously had 2 false pregnancies following a healthy litter.This time,she had a little bleed in week four (normally a good sign) and brought bile up overnight at around week 6/7 (again a good sign). She has been a bit sticky (good again) but now she is due just looks like a normal shape. Her character has changed like in normal pregnancy and I decided to start taking her temperature "just in case" she was hiding a single pup under her ribcage. Her temperature is what I would expect her to be in the last week of pregnancy, fluctuating from lowest 37.6 (99.6) to 38.1 (100.6) highest. I am now wondering if she will suddenly plummet to just under 37.2 (99) and whelp. Does anyone have any experience of pseudo pregnancies - would the temperature be lower as if they were to whelp? She is in milk but had milk with her last false pregnancy. Please reply if you have experienced similar.