Need advice with wild 14 month old

Ok so my little one is 14 months old. The past two months she’s totally turned into a wild child. I’m also pregnant and things are getting a lot harder. But I feel like every little thing is a fight and she’s constantly testing me. I know I need to be more patient but I feel like I’m starting to lose my mind. She’s hitting and scratching me. I constantly feel like she gets angry with me and idk why. She throws fits for every little thing, especially diaper changes. I’m the one who is with her basically 24/7 so I’m guessing that has a lot to do with it. I’m trying my best with her every day. Any advice??