First of all, congrats on the pregnancy ernjkly! How exciting! :)
I've never worked in research, so I can't really compare, but I do know that in a clinical setting there really is no taking work home with you, which is one thing I've always been thankful for! And it is often family friendly in terms of scheduling.
Hopefully everything times out perfectly for you, and you will wrap up your Masters program before baby arrives! I think it's good that you want to finish, being so close to the end as you are!
I also love to hear that you are open to staying home with baby and putting your career and education on hold for awhile. I know so many who feel pressure to keep working and building their careers to justify the degree they worked so hard to obtain. I myself struggled with that for so long. It can seem like a waste, especially if you have student loans to pay back. In the end, I realized it was silly to live my life tethered to my degree and student loans. (When it went against everything I truly wanted to do). Do what's in your heart, and it will work itself out!
We will be on a tight budget too once I quit, and I will miss my job a lot. (I do hope to maybe work one day a week, and pick up more hours over summers when people are on vacation). Anyhow, maybe you should join me in lurking over in the frugality/finances/homesteading/gardening forums! I'm trying to learn everything I can on stretching our budget and making do with less!