Very cool! I’m late on this thread, sorry! (I remember the old one, as I was all planning to recommend TCOYF but was beat to it…).
RE: the OP - when did I know?
First pregnancy, I realized I was pregnant when I got cramps but NO PMS symptoms about a week before my period was due. It was the first month of trying.
Second pregnancy, I had some peculiar spiritual events that said I was pregnant, but also said that whatever happened was right, and not to be concerned. I miscarried. But I also had that really deep sense that it was okay, so I didn’t worry. That one was a whoops.
Third pregnancy (again, first month of trying), I had breast soreness, nausea, and dizzy spells before my period was due. They came and went in apparently random patterns. I had no peculiar spiritual events, and miscarried again. This time, it sucked (emotionally speaking). But I recovered.
Implantation failure the next time (first try again), had strong nausea/dizzy/etc. symptoms but they faded about three days after they started, and my period was early. I don’t count that one as a true miscarriage, though - no positive test or other signs, just was paying enough attention to recognize something that happens A LOT and most people don’t notice.
Fourth pregnancy (second month of trying, but the previous month had been anovulatory), I the first symptom was my nipples changing color (TMI, I know). They darken, you may have noticed? I’d noticed the darkening thing with the other pregs, but it wasn’t the first thing I noticed. Plus my resting temp was so high I thought I had a virus for a short while (nearly 100 degrees, when I seldom get a fever at all), and I also got the HUNGRIES, and started peeing like crazy. Then I got the other usual symptoms (breast soreness, nausea, cravings), and I could feel my uterus like a rock (swollen/hard feeling) when I slept on my stomach. But I kept getting negative tests. Negative, negative, negative. And my ‘other’ symptoms jumped around a lot, making me wonder about another miscarriage. Nope, no problem - I didn’t test positive until well over a week late, and even then only with the super-duper-sensitive test. But aside from a bothersome late-third-trimester case of polyhydramnios (too much amniotic fluid), it was a fine healthy pregnancy, and Brendan was born on his due date.
And hopefully we’ll be trying again in a few months! YAY! 
RE: Books I Like
The Unofficial Guide to Having a Baby - it isn’t from one perspective, it covers everything, from medical to non medical, including how to have a good hospital birth and how to prepare properly for a home birth. Labor management/class approaches are described in detail so you can pick what suits you rather than wondering what the propaganda isn’t telling you. Very detailed medical info, but not scare tactics. It assumes you have a brain, you just need information so you can choose for yourself. Any of the Ann Douglas books are pretty decent, from what I’ve heard (I don’t have the “mother of all” books, but have heard good things).
BTW, I’d skip even reading the Ezzo stuff. If you are looking for something more mainstream than Sears, try The Baby Whisperer or The Happiest Baby on the Block. Ezzo’s stuff has caused so many crises (including documented failure to thrive babies) it isn’t worth using as a ‘balance’ reading material. It is well written (convincing), so if you don’t have other info, it is very hard to filter the dangerous info from the okay. Stick with the ones that don’t cause such a stir, and you’ll still have plenty to read. If you read it anyway, keep your salt shaker handy. Actually, for anything, using your brain and letting your reactions guide you is a good bet - instincts and ‘this doesn’t feel right’ feelings are very good starting places for parenthood decisions.
For breastfeeding books, I like So That’s What They’re For. If you are planning to go back to work, Working Mother, Nursing Mother (or is that the other way around?) is also a very good bet. I found the usually-recommended book from LLL too unfriendly to working moms.
For birth, I’ve used pretty much everything - Birthing from Within, Natural Childbirth the Bradley Way, the Unofficial Guide to Having a Baby, the Birth Book (Sears), HypnoBirthing. I also highly recommend The Birth Partner. It covers all sorts of situations with actual data, and gives specifics about what to do when and why (many options, including water birth, c-sections, meds, etc.). The wider your reading on that topic, the more likely you’ll have the info you need, and will be able to filter out what doesn’t suit you. I ended up using Bradley the first time (plus an epidural eventually - long labor), and HypnoBirthing the second time (short labor with pitocin, no pain, WOO-HOO!). I way like the hypnosis approach! (feel free to email if you want more info)
As for AP and Sears, yes, read with your handy grain of salt - without, you may find some parts patronizing. But there is loads of good stuff in there, and there is an underlying assumption that you do what works for your family, not just what works for baby. It is understanding and responding to what your baby needs without listening to anyone else (including the Sears’) that is the core of it. We probably qualify as AP, though we don’t cloth diaper and we only coslept with Gabe as long as it worked for all of us (4.5 months). We use a crib as a sidecar bed this time (Brendan) and find it has worked very well. Different child, different arrangement, different needs, different responses. :shrug: I do find that as a working mom, I like having him in bed with me - I don’t feel like I’m missing as much, including SLEEP! I often only know he nursed because I wake up not engorged… very handy, and I still get to have my side of the bed, and he gets his own sleep space (in the crib).
Elizabeth Pantley’s parenting books are also very good, IMHO. And I love the Girlfriend’s Guide to Toddlers, even though I was so-so on the pregnancy and first-year books (some very good, but definite grain of salt at times). But those are a bit down the line…
Is that enough? 
RE: Pillows and Boppies
I found the Boppy slipped right off my middle all the time. Never used it much. But a body pillow… now there is a good idea! Used one with both boys, and actually brought it to the hospital with me both times! Very useful for propping up in comfortable positions.
Re: meltdowns
Hey, this is a big change! This is one of those areas where the Girlfriend’s Guide is a big help. I really thought I was rational even when I was melting down - I mean, I should still be in a shaking rage 45 minutes after someone almost cut me off on the highway, shouldn’t I? Doesn’t that person realize that there are LIVES AT STAKE??? Fortunately epeepunk was very good at not rolling his eyes where I could see him, and offered me hugs without commentary. Later, I laughed about it, too. But at the time? Not hardly!
Congrats again. I remember it feeling surreal, too, every time! Once you feel them move, though, it starts to really feel real. Meaning, at that point, reality (including the anxieties and fears and worry) really set in. But you’ll do fine.
Another website to check out (that has another few SDMBers at it) is www.StorkNet.com .