My bitch has been in labor for 24 hrs, not sure if contractions have started yet... should I give her some calcium now in form of Tums? If so, how to get her to eat it? The vet also gv me Oxytocin but I am very reluctant to use it as I've heard bad things can happen from it. Please advise... ASAP (it's currently 2:36 am May 25 mountain time). Thank you!