Well, as with most things, anything is possible. Yeah, they may breed, and yes, you may lose your female during gestation for multiple reasons. You will have that risk though regardless of her size. How old is the female, and the male? That may change things a bit as well, as far as your percentage for success or failure. If your 3' male is 8 months old, and your 6' female is under 2 years old, probably slim chances of success. If your female is 15 years old, topped out at her current length, and as heavy bodied as she's going to get, and your male is 18 months or older, just a small guy...I'd say your chances increase for success. There are lots and lots of variables. Best of luck to you. Take care,
Paul