I totally feel you! My husband is writing his master's thesis and applying for jobs and working part time, so we are praying that he lands a permanent position by the time the baby comes! I'm working fulltime in finance, but training to become a midwife. Eventually, I need to leave my dayjob in order to be on-call for births, but financially right now, we definitely need my income.
I'm pretty lucky in that physically I feel good (no nausea for the most part) outside of being exhausted. Last week was totally insane- both of my teammates were unexpectedly out of the office the entire week, so I was covering for 3 jobs all week, and we have end-of-month deadlines. Though getting paid for working overtime is nice, I don't exactly want to be working overtime! And it is not like I can tell my boss why I'm so exhausted... I'm definitely unmotivated to work, which is bad. All I can think about is this amazing human being that is growing inside me.
My office has a "mother's room" for nursing, with a padded bench. I brought a small blanket I keep in my desk and laid down for 30 minutes one day last week- that made a huge difference. It is hard to get away though, and I feel like I have to sneak in there, or else announce to the whole world I'm preggo.
Ideally, after baby is born, I'll not go back to work (hopefully). At least, in finance. I intend to transition into midwifery. That will be tough to juggle with a baby and being on-call, but I need to do an apprenticeship with other midwives before I can catch babies. I'm getting certified as a Doula this weekend, and I also intend on getting certified as a childbirth educator and lactation consultant, and once I'm a momma, transitioning permanently into the birthing world.
But in the mean time, first trimester is hard for working moms! Keep your chin up. I know it is hard for SAHMs too. We don't yet "look" pregnant to the world, yet we feel yucky, tired, emotional, and we have no sympathy from the public. I ride the train in the morning with a colleague & friend who is now 34 weeks with twins. It is unbelievable how rude people are to her, and how every singe time she has to ask someone to slide over so she can sit down. I absolutely think pregnant women are specially and should be treated special and pampered (my husband jokes that I hit on pregnant women). But, the world at large doesn't know we're pregnant yet, so no special treatment!
Sorry if I was ranting!