I'm getting discouraged

I'm starting to get really frustrated. Here I am, the first day of my 13th week. It is just the beginning of the 13th, but I really had high hopes to be feeling better. The last three days have been bad. The last two days I've had to go back to bed after Jack left for school. What is up? I have no energy. None. The saliva factor is out of control, too. Uuuggghhh! I'm just not a good pregnant person. I'm afflicted with anything that has ever been written about. I'm convinced.