
there are 17days between her 1st & final mating. The danger of having several matings is that you don't have an accurate due date.
It also means, even though she was standing for the first mating, she probably wasn't ready as she wouldn't of still been standing so many days later.
You say her temp is up & down, this is quite normal, but have you seen a significant drop? when you see this - then she should go into labour within 24hours.
if your vet has checked her over & said all is ok, there isn't much else you can do, except monitor her closely & contact the vet again if you are worried or if she becomes distressed.
Good luck :)