@Motala - That is good that you talked to Jan and glad to hear that she had not been spayed. I still think that your Vet and you should connect with Dr. Gonto about your girl's blood work and blood gas results and if he has any thoughts about it.
Welcome aboard, but do share his registered name ? Who are Dad and Mom and what was his date of birth so we can be sure to add him to the Basenji pedigree on-line database (with a photo ???) for the world to share him. http://www.pedigrees.zandebasenjis.com/
@msjames, @tanza did you a solid favor outlining expectations. Networking really is key to finding a "reputable" breeder. Most show their dogs and are connected to other breeders through showing. They all seem to know who is planning a litter and who isn't. I completely agree with Pat that you should meet your breeder in person prior to the puppies even being born. You can learn a lot.
Is a Basenji right for you? If you want a dog to hang with you in the driveway with the garage door open as you chat with neighbors, or stand calmly with the front door open as you receive a UPS package... ABSOLUTELY NOT!!! Basenjis will bolt. they'll be gone in a second. They see it. They chase it. And if you think you have them trained... no. They've trained you. When they see it they will chase it.
Basenjis, in my experience, need exercise. Mine get two walks a day. When they don't, they can be destructive. They're not shy about expressing frustration or displeasure through chewing up your best stuff. A big secure yard can mitigate this, but that's not a guarantee. They love seeing outside, so keep your blinds and drapes open otherwise they may open them themselves even if that requires chewing through them. They will climb onto windowsills, tables and low counter tops. They are capable of scaling a six-foot fence. They are known to climb trees. These are extreme examples, but better to know now.
They are super affectionate. They can be trained... to a point. They are clowns and provide endless entertainment. A Basenji baroo is the best sound ever! They love to snuggle and will sleep on your bed and under the spreads and sheets if you let them. They love to share body heat. Tail twitches when I return home are the best!