I don’t know what to do….

So I’m 8 weeks pregnant with my second child. I was excited at first but as time goes on I’m starting to feel like I’m making a mistake if I continue with the pregnancy. My son is 3 and he has been out of control lately and not listening and just overall being a handful as a child is but I have been getting very easily overstimulated with him and the way he’s acting. I feel like I’m being a terrible mom because I’m constantly having to raise my voice for him to listen to me. I’ve even had to tap his hands at times and I just feel so shitty about it but he just does not listen, no matter how hard I try with explaining to him why we don’t do things and I know I’m going to get hate for not gentle parenting. I am just so scared that if I bring a second child into our lives that I’ll be making a mistake because I can’t even control my first child properly that it’s actually very embarrassing. Idk today I’m just in such a depressed mood that my feelings are all over the place. I feel like I’m such a shitty mom now that bringing another child into the word won’t be good.