You are going to have your hands full for a few days, that's for sure
The female usually accepts the male 7-9 days after the first signs of blood, but each dog is different, so it could be longer. You are probably safe as long as there is a bloody discharge but I wouldn't take any chances. Once the female starts flagging and flirting she will accept the male and it could last for another week or so. I'm sorry, but I really don't have a solution for you as to what to do with your girls. If you have males in the neighborhood that run loose, this could be a big problem for you. I've never had intact females that weren't my breeding girls and, of course, I want them bred.