Worried im a go crazy

So I'm currently 7months and I've made a big decision and change in my life recently (I've moved out of town) to get my life together but as I'm doing all of this I'm also helping my god mother out by watching her 2year old daughter whom I've basically raised since birth but moral of the story her baby is extremely bad and since I've found out I'm pregnant she hits me in the belly with things and just gives me a very hard time. I'm worried that when my baby girl arrives she may try and harm her which won't pass by me AT ALL! I'm trying my hardest to continue helping my god mother out because she and my so are providing for my baby right now since I'm not eligible to work at this moment but I have a feeling I might be moving out into my own house because I refuse to stress and worry about her harming my unborn child. And yes she gets in trouble but nothing seems to work and I'm simply not going to whoop her because I wouldn't whoop my own child, I tell her mother and she also sees for her self but nothing is done as I said before I've basically raised her from birth!