With the greatest respect I believe you should do alot more research before breeding your dog, especially if you weren't even sure if what you were seeing was a season or not.
Some of the things you want to consider are...
Do you have the money for any possible complications?
Do you have the money/space to keep any/all puppies if their 'forever' home falls through. Or would you just expect the owner to put them into an animal rescue?
Do you have someone with lots of experience of breeding dogs on hand to be there in person if you need help?
Is you dog a breed that is currenly sought after? Or is it overbred eg. staffies (in the uk they're very much overbred)
Are you breeding her because she is a prime example of her breed? Or because you 'think she's cute' or would 'make a great mom' or think it'll make you money etc etc.
Is she kennel club registered? Is she a pure bred?
Have you had her checked over by a vet for any/all breed related conditions/illness?
Here is a page of possibilities that should be considered by any breeder...
http

/www.woodhavenlabs.com/breeding/breeder2.html
I'm not in any way aiming any of this specifically at you. And the fish forum probably isn't the place for it anyways! lol. But I'm just making some honest, true points that should be thought about by anyone wanting to breed their dog.