Ok I found a breeder that offers stud service. She has a 3 year old male that has produced 10 litters in the past 2 years (so he is very expierenced)

. She charges a fee of $400.00. But in her contract it says they only get together one time during her heat cycle. If Amber does not get pregnant at that time she will let them try again one time on her next heat free of charge. If she does not get pregnant then I am out of $400.00

. I guess my question is is one time during her heat cycle good enough for her to get pregnant? Is it easy for a Yorkie to get pregnant? Any other advise or information would be appreciated.
Thanks,