Hi Angelidiluce, Pepper and Pancho....Welcome to YT!!!
Sorry, I don't know much about your question but I just wanted to welcome you to our community.
I am coming up on the time to make a decision myself b/c my Cookie is going to be 6 months this month...to spay or not to spay

I don't know if I should let her have one litter and then get her spayed or just do it now...

Obviously I have questions of my own...LOL!
Well welcome to YT...there are many helpful members here who are sure to point you in some direction.
-RubyC