Working Hours

I am currently 17 weeks pregnant with my first child. I currently work 42.5hours a week (5days a week)
I am out of my house by 7am and not getting home till gone 7-715pm. I have been in bed since Friday with bad exhaustion.
I just wanted to see if anyone else think that doing these long days is too much? I am the only person at my work who does this many hours and I'm always doing the late shift. 
Thoughts on this would be appreciated