It is up to your male if he is really ready or not. He may not be fully mature at 7 1/2 months. A vet can check a sample of his stuff and and see if they are active yet or you can play the waiting game. I know our Gizmo was not ready until he was a year old. He did the deed, but nothing came from it. We did the test and once it was good to go we bred again. Now he is a 1 1/2 years old and has two litters of pups. The GREAT news is even if your guy wasn't fully mature yet he at least knew what he was doing. A lot of males need help from the breeders for this. So good luck and keep your fingers crossed
You can also get an ultrasound later and see if the vet hears any heartbeats..I hope I helped!