Jerk of a boss?

Melissa
In need of some encouraging thoughts or advice please! Has anyone worked throughout their pregnancy for a boss who all the sudden becomes a jerk? 
My boss has his moments but has never had any big issues with me... until now it seems. I've been so sick and I've only requested one morning off due to horrible nausea and vomiting and the other days i just bare through it at work. I've Kept my pace pretty well but I have "pregnancy brain" now it seems, and im just exhausted.Like I said I haven't slowed down much and I'm pushing myself to keep up, but it just seems like he is un-understanding, rude, and impatient. In spite of my best efforts to explain myself and work even harder. I'm about at my wits end and holding back confronting him because that would not turn out well seeing that I am an emotional pregnant person.Someone to relate to would be nice...