15 weeks tomorrow - hard to believe it

I can't believe we've made it this far. I keep praying for the best, but still thinking that the other shoe could drop. Hopefully things will continue to go smoothly. DH says I'm getting a bit of a belly now, and I agree that even now I can't suck it in as well as I could last weekend for our 14 week photo.
We went to Chicago for the long weekend, and had a great time. I had some Brie or Camembert on the plane on the way down, then felt guilty about eating a soft cheese without being certain it was pasteurized. I had the Italian place check that their ricotta was pasteurized the next night before ordering a really tasty pasta dish. We stuffed our faces at breakfast one day, and had a great Argentinian meal the next night. Walked a ton, checked out the architecture, and had lunch at the Mexican market on Sunday. Tasty tacos and tamales, for pretty cheap. Yum! And then to finish things off, I had some great crab and veggie sushi with a mango/banana smoothie on the way back to the airport. It was fantastic.
Then I didn't sleep well the first night we were back. Had some weird dream about spotting and something having gone wrong (though I was a little earlier on in the pregnancy, I think), and so I had to find my way to a doppler at work the next day to reconfirm that baby's ok. I had 45 seconds of sheer panic when I couldn't find the heartbeat in its previous location (found my own heart ticking away at 90/min, when it's usually around 60), but finally located it pretty high up and on the other side of my belly. I guess things are growing and the kid is shifting around. I can't wait until I can feel it move for reassurance.
Last week was the anniversary of the day our first baby should have turned 2. I didn't work out the due date for our second baby, since things looked bad right from the start, so I don't have the same milestones to regret not seeing for that one. It was also the day that my niece (my brother has 2 boys already) was due, but she waited until my SIL was induced yesterday to make her appearance. Thank God, I'm still pregnant, or I don't know how I would have handled seeing them have healthy baby #3 without any issues whatsoever. Having some hope for DH and me and our baby makes a big difference to the amount of envy I'm feeling.
My department chief is away for another 2 weeks, but I'm planning to break the news at work when he gets back. I don't know how much longer it'll be before people start asking if I'm pregnant. My next antenatal visit is next Thursday, and after that I'll feel more comfortable sharing things with colleagues and acquaintances.
So far I've only gained about 1kg. I'm not sure if this is ok (didn't really have any morning sickness to speak of so far, so that's not an excuse). I started off with a BMI of 18.7, so on the skinny side. A couple websites I've looked at said 1-4lb in the first trimester, and that I should gain 28-40lb overall (or 11-16kg), and gain about 1lb a week in the second and third trimesters. I guess I'd better start bumping up my snack/calorie intake! It's pretty challenging when I struggle to find time to heat up food for lunch at work, and when my only time to eat is during a case when I can stand outside the OR and keep an eye on things while I chew. Somehow I need to get more protein into me - must buy some fresh almonds, because the ones I have all taste a little old and rancid to me. Yuck. And I need more fruits and veg too. Maybe I should start making more soups, since I love to eat those. And even sandwiches that I can keep in my bag and not have to reheat might work too. When you're restricted to tuna/cheese/PB&J though because of the no-cold-cuts edict, that doesn't sound all that appealing. Any tips?