Okay - so here are some tips that you may or may not find helpful :)
Like you, I snack on fruit typically and I don't keep track of the amount I eat of it. It may sound silly, but if I limited myself by serving size on fruit, I would end up eating a bunch of other crap lol. So, if I want 3 servings of watermelon, or 4 clementines, or whatever, I just eat it. I don't believe in watching serving size on the lower calorie fruits and veggies (I watch bananas, plums, pears, potatoes, etc because of the amount of sugar in it).
Over all, I tend to go for a high protein, high fiber diet (I keep an eye on the calories of items so I know ahead of time what things are better choices, but I don't count calories and I don't pay too much attention to anything else). Especially when pregnant - we all know that fiber can help things lol, plus it helps you to stay full longer, similarly protein can help you to feel more full, but it will give you longer lasting energy and it is one of the most important things to a developing baby (somehow protein sometimes gets overlooked a bit). I love things that are high protein but low calorie like tuna with light miracle whip (a can which is usually 2 servings has 100-120 calories depending on the brand, 26 grams of protein, no carbs and only 1 gram of fat which is unsaturated fat) - if you like shrimp, crab, crayfish, or lobster they all are right about the same statistics as long as you don't batter, fry or dip in butter. But yes, I eat those types of things as a snack many times instead of traditional "snack" food - wayyy more nutrient and protein dense!
Since we shouldn't eat a ton of tuna while preggy, I mix in stuff of like light english muffins with added fiber (fiber helps you to stay full longer and will help regulate you which I am sure you know - but they have 100 calories for a full eng muff, plus 8 grams of fiber and 5 grams of protein, you can use sugar free jelly with fiber which has 3 grams of fiber and only 10 calories per tablespoon, or top it with sliced bananas for some extra potassium!). But generally, when I am buying something like bread, I try to look for the best combination of where the calories are coming from (sometimes I get light/low calorie products, sometimes I don't), but if I see an option for bread with 3 grams of protein and 2 grams of fiber verses some that has 2 grams of protein and no fiber - I'll take the first one (although I don't go crazy on price, I don't mind spending a little bit more for a few items). I try to sneak beans in to family dinners as much as possible (I don't eat them by themselves), but it adds 6 grams of fiber and 6 grams of protein roughly with each serving - I love making this Mexican chicken dish that is a lb of chicken breast, 1 can of tomatoes, 1 can of corn, 1 can of black beans, 1 cup of instant rice (you can use many types), plus some cheese and a little bit of seasoning, but you get so many veggies and lots of protein and its a family favorite around here. Not sure if that any of that is applicable or not - just thought I would share!
On another note, I tend to gain most of weight in the first trimester (totally opposite of what is normal lol). My first one I gained 19 lbs total and 12 lbs was in the first trimester (had him at 37w4d. Birth weight 7lbs 0 oz). My second I gained about 22 lbs (I went 3.5 weeks longer than my first pregnancy - 42w0d. Birth weight 7 lbs 14 oz). If I remember correctly, I gained about 8 or 9 of it in the first trimester, and almost all of the rest in the third trimester. This time around though I am not quite following the same path - I am 10 weeks and only up 1.5 - 2.5 lbs (depending on the day thanks to bloating lol). I have believed that I gain more in the beginning because I started under weight, or on the edge of underweight according to BMIs with all of my pregnancies, I am healthy though, just thin. But I think that I gain more weight in the first trimester because my body is trying to get up to a more normal weight.
Wow - apparently I am feeling chatting or something today with how long that response was .