I was wondering ...how your pup is?? Did you take her to the vet?? What did he/she said?? Is she ok??
Did you discuss with the vet about spaying her? I don't want to sound harsh but breeding her may not be very responsible.
Every time you feel that there is something about your dog that you don't know..it's definitely vet time! And don't be afraid to puss the vet to really check her...I'm saying this cause I have seen vets just touch the dog here and there and say "everything is fine" and a few days/weeks later you go back to the vet with something serious that you may have prevented if the vet had check her in the first time! (NOT that this happens all the time tho)