mood swings already?

my wife is almost 8 weeks pregnant. shes usually pretty chill but now shes sleeping all day, sad, mad, crying, getting pissed about small stuff. been doing anything I can but nothing makes her feel better. do crazy moods usually start this early (7 weeks) an do they end or is this all 9 months? I read the gym helps some dads cope but anything else? I feel useless honestly.