
I suppose it all depends on why you are hoping to breed.
You will be very lucky to get a boy that is a best match for your girl. Those rarely sleep on our own sofa. After having a litter by your boy, what next? Why does your boyfriend think it is a good idea to own your own stud?
I always say why would I get a male, feed, insure,pay for health testing, go through hassle of separating etc when I have the all males in the world to choose from at much less cost. I can choose the very best for my girls each time.
I would try again next season and keep a puppy from that like you originally planned. Would you keep a puppy too as well as buying in a male puppy?
If not, why breed a litter?
By the way, slip mating can and often do result in litter :-). Did the blood testing reveal she was over before the slip mating?