I would stick with the foal-time strips, it can go up and down for a few days but then it should drop. Remember that milk testing is like the icing on the cake, she will only foal when everything else is in place: i.e baby cooked, baby dropped, mum is ready and finally milk. Inducing foals is a risky business but can be done, I will be inducing one of my mares this year, my vet will come morning and evening to check her and her milk and then when the moment is right she will induce. This decision didn't come easily but I have a mare that is a special case, my vet and I have talked it over and over and decided that it is the only way to get a healthy baby. I wouldn't advice inducing a foal unless there is a medical reason.