Your pregnant it's hormones
like majikat said...its normal...this is my second pregnancy and hopefully my first birth...i got so mad at my husband once that i threw myself onto the bed and started having a temper tantrum...then two seconds later i was laughing hysterically because he looked so incredulous..it'll happen, maybe not that extreme, but it'll happen
It's perfectly normal to feel overwhelmed with everything especially with your first child.... There are also a lot of crazy hormone in your body too now.... Don't worry you will do fine all you can do is be the best that you can be