Hormonal, going crazy and feel like the worst mom

I’m 31 weeks pregnant. My oldest has ADHD and is on the autism spectrum disorder. My husband is out of town and I can’t wait for him to come back. These last few days, my son has been the most disrespectful kid ever! I don’t know what’s gotten into him. He’s usually very good and I don’t have to get on to him at all. He’s been telling me no when I ask him to do something, he’s not listening to anything I say, talks back, tells me he’s the boss, the list goes on. What really put the icing on the cake was him pouring a full glass of drink after he was told to hang on a minute (I was putting clothes in the drier) and spilt the whole entire jug. It covered the entire counter and went all beside the fridge. I had to move the fridge to clean it. That was heavy. I’ve already been hurting all on my right side for the past week. I can’t lift my leg to even put it on the bed. I’m in tears because I’m hurting and yelled at my son. I never do that, I never spank/pop him, I’m usually very very calm with him, but I blew up. I feel so bad! I called my mom and cried to her.