[Mistymillar]

Hi there,
I am by no means an expert, not a breeder nor a biologist, but yes I would be concerned that an intact male was freely around to sniff a young bitch who if she is not already in heat will be at any time soon. Boys will be boys. You have had experience of puppy litters, did boys sniffing girls play a part in the conception?
I am starting to get worried about my baby boy, he is not neutered yet and is generally either in the house, in a secure back garden or on a strong leash when outside (with me or my husband at all times) though he does get off for a good ball chasing run in our local park most days.
Dogs will scent a bitch in heat a mile off and have accomplished unbelievable feats to get to them, if a readily available female is in the same house, I would bet you will have a pregnant little baby girl on your hands soon if she is not already so.
Good luck, I hope they haven't tied yet and you are able to completely separate them.