Will It Hurt Baby?

I’m staying with my mom for the night due to some relationship issues and I brought my puppy with me, well my brother’s dog is also staying here for the week because he’s on vacation. He has a boxer and I have a very small mixed breed. The boxer charged at her (not aggressively, he just gets extremely excited because he LOVES other animals) and of course her not being used to big dogs, she freaked out, so I grabbed him by his collar and pulled him away (he’s fully grown so probably somewhere between 60-70lbs) to hold him back until my mom could get in the room (maybe a minute or two later). I know you’re not supposed to lift heavy things, but will having pulled him back with him being so heavy hurt the baby?? I’m 9weeks with my Rainbow baby and so scared that I hurt my baby😩