Hi Kristen,
Oh, how you sound like me! I'm am totally an overachiever and I always try to pull my load and never ask for help. I worked full time through my entire pregnancy (and already had an 18-month-old at home) and I was EXHAUSTED!!! I took a nap almost every day after work. At the time, I was also working strange hours (6am to 2pm), so I had to be up at 4am to make it to work on time. Not fun at all. And on top of that, I took a couple courses for my master's degree online during my pregnancy as well.
Lucky for me, my boss used to be a social worker, and she is more than understanding about personal issues/needs of her employees...and I was able to cut down my hours near the end of the pregnancy. It's always nice to have a boss that's understanding, which it sounds like yours isnt <img src="i/expressions/face-icon-small-sad.gif" border="0">
But anyhow, the most important thing to remember is that this is YOUR life and your BABY's life. You two should be the most important things in your life right now. Of course, we all need income, so working is something tnat usually needs to be done. But maybe you could cut down your hours during the pregnancy (and most likely after the baby's born as well) just to keep your sanity and keep your health good.
I know from experience that it is also important to have time with your spouse. We were miserable when we worked opposite shifts and never saw each other. Relationship, what relationship?--We NEVER saw each other! Your mental health and having the support of your husband is extremely important as well. And part of the pregnancy process is enjoying your time together, bonding with your unborn baby, and just taking the whole process in.
I know that there are times when you have to just buckle down, work hard, and push through...and there are times when you just need to accept what things are, adjust things, and make things work around your needs. It's just a decision that you will have to make for yourself, your baby, and your family. If you find that you can work a part-time job/hours instead and you can afford that, then maybe that is what you need to do.
Good luck and stay positive <img src="i/expressions/face-icon-small-smile.gif" border="0">