I'll be honest, I'm pretty minimal. I don't like having a lot of "stuff". I'm regularly going through my, already minimal, home and purging what's not needed. So that mindset carries over to what I feel is necessary for pregnancy. When my clients ask me what they need, I'm honest with them, I probably won't recommend the newest and fanciest gadget, but what I do suggest are things I've personally seen and experienced to be helpful.
1.) A great, pure, natural prenatal vitamin
This can be trail and error as to what works for you personally and what your midwife or doctor recommends for you. But generally, my favorite prenatal is Rainbow Light One-a-Day. There are other great prenatal vitamins out there but many of the natural ones require that you take them up to 3 times a day. I just didn't have the time (or stomach) for that- so I found that this prenatal was more minimal for my needs.
2.) A Boppy or similar pregnancy pillow
To save space a good nursing pillow can double as a nightly pregnancy support pillow for mom.
3.) A Birthing/Exercise Ball
This is a MUST HAVE. I tell my clients to bounce, bounce, bounce for hours a day. Exercise balls are IDEAL for easy pelvic opening and relaxing for pregnancy which make for a much easier birth. Find a ball that when you sit on it your knees are at a straight, 90 degree angle. I find the ball also helps with sore back and hip pains.
4.) Stretchy everything.
Yoga pants, flowy shirts, canvas shoes, sports bras. If you hate spending money on maternity clothes that you'll likely never wear again... Embrace the elastic. Chances are you'll be able to wear them during postpartum too.
5.) A Doula who also provides Herbal Support
Ok, ok, I know you think I'm tooting my own horn here, but I'm serious. When you factor in on-call support (think, it's 2 am did I pee myself or did my water break??), childbirth and pregnancy education, pain management during labor... AND if she can couple that with natural herbs, teas, and remedies? You're gold. Or maybe you don't want or need herbal support but are interested in a doula who also offers yoga lessons, massage, or something else you're interested in. That's a value for sure if you add up all of those services individually, you'll find that a doula is actually the most cost effective way to go.
You really and truly don't need too much for pregnancy. You don't need to read every book, buy every gadget, or go to every class. You already have everything you need within yourself to care for your growing baby. The extra support of items are just an add-on to that. You got this mama!