I have a male and a female Jack Russell Terrier. She is currently in heat and they are mating and they have been tied several times. I know this is a normal thing for them to get stuck together. A while back I had no idea this is how dogs mate. After doing some research and deciding to breed my Jack's I have figured out that this is normal. My question is do they stop trying to mate after she has become pregnant? If they do not, will that harm her?

I am not totally 100% sure she is pregnant, but I assume that she is because of the numerous times they have tried. They are both healthy and up to date on their shots and I got the ok from the vet to breed these specific dogs together. I just want to ensure that I do everything I can to help her to stay healthy and produce healthy pups. We are waiting to take her to the vet because I read that you are supposed to wait at least two weeks from the first time they mated to take them to the vet to be tested for pregnancy. Any help on this topic is greatly appreciated! Thanks!