Has anyone ever called off or wanted to call off of work because of pregnancy ailments but felt like you couldn't?

I have a migrane ready to burst through my skull and backaches that make any movement impossible. I puked this morning and didn't get much sleep either. I just want a night off to recuperate. A few hours to rest and get myself and baby up to health again. But I can't bring myself to call in.

People call into work to see movies coming out. They call in to enjoy a nice day. They call in because they are tired. But I feel guilty doing it because pregnancy isn't a sickness. It was my choice to become pregnant.

I have worked for my job for over a year and never called in. Ever. I have covered for others and worked 14 hours days. I never ever call in or leave early even when I really am sick.

How do I give myself permission to get better and rest? Is it selfish to call in for pregnancy stuff?