My female dachshund was in heat about 5 weeks ago. Although I was very careful with her going outside, I am not sure if another family member was not. She now has very swollen nipples and it looks like she is getting rounder. I her in a diaper the entire time she was bleeding except when I took her out to do the restroom. The only other dog we have is a male husky about 4 months old. Is it possible that she is pregnant? If so, could the young husky have done it? I am also afraid if she is pregnant, would the size difference be a problem?