Good morning and welcome. I am Dr. Loretta, a licensed veterinarian and would like to help.
First, make sure that she is pregnant by taking her to your vet for an exam. Often with the first heat, she may not take. If she is pregnant, after 30 days, start her on Puppy food to give her extra calcium and Phosphorus that she needs for bones
and milk. Even with a larger male, there may not be any problem with delivery but you should watch her. When she starts the process, if she is pushing more than 1 hr NON STOP with no results, the puppy may be too big and you will require veterinary assistance. This LINK will explain in more detail:
Does that make sense to you?
Please let me know if you have any other questions. I am happy to help. My goal is 100% satisfaction and if you are not satisfied, REPLY and I am happy to clarify for you.
Sincerely, ***** *****