Angry, overreacts and irritable!

Le
I'm on my 12th week, as time goes by I can feel like part of my personality is changing. I've always been so understanding, patient and caring, but ever since I got pregnant I think my hormones are giving me crazy mood swings. I tend to overreact and get mad over little things that my SO does. It would make me feel so frustrated that it would lead to an argument. I feel horrible for saying hurtful things to him. Today I woke up and I'm having mixed emotions again. All my friends who have kids said they went thru the same. That my SO should be more patient and understanding to me since a lot of changes are going on. I feel like a dck sometimes for saying mean stuff to him. Anyone goin thru the same?  How did your partner handles it?