I believe pit bulls & Rottweilers are excellent with kids since that's all I ever grew up around even tho ppl say those dogs are "the most dangerous" there actually just very protective over their family& will do everything that they can so that their family doesn't get hurt.
What breed/mix is your dog? Some breeds tend to be excellent with kids, and some tend to bite them.
Yur dog is going to become very protective over yur baby. When my mom was pregnant with me her&my dad had a Rottweiler & he didn't like anyone going by my mom or even seem like they were getting rough with her then when she had me he would stay by my crib even if I was sleeping & he almost bit my cousin once cuss my cousin came in my room while I was in my crib & the dog felt like I was in danger. Its actually good yur dog is like this cuss at least yu know yu & yur baby will always be Safe with him around.
As a dog trainer, dogs pick up hormone changes and a new life in you and will become very protective over you and your baby to be. Just as they would do with their babies. Involving your dog and reassuring it you are ok will help. Dog training would be a benefit and spaying/neutering will help with its over protective hormones
I would look into training. It'll be good for the pup regardless
Has this just started Started since u got prego if so the puppy is prob going to be over protective of your baby as well