I have a lot of sympathy for you OP, but I can also see why your DH is worried.
My advice, for what it's worth, is that you shd keep your focus on eating WELL, but maybe make some tweaks.
BMI is looking at weight/height only ... ie doesn't look at % fat versus % muscle ... so check you are strong and that you have sufficient strength to get you thru a pregnancy, and still have enough in reserve for the post-birth babycare?
It can be exhausting not getting enough sleep after the baby arrives, with the risk of turning to sugars and 'bad' carbs just to keep going, so best to be in peak condition before you give birth if poss ... like training for a big sports event!
Maybe include more good fats in your diet? (Eg quality olive oil, butter?) They will keep you warm/feeling full, and are good for general health. And more protein? (Eg eggs for bfast instead of dry toast? Eggs are full of goodness and keep you going a long time.)
And a bit more dairy too, if you want strong bones for your old age? So some cheese, more milk/cream, or full-fat plain greek yog? But make sure you are getting enough veg/fibre/fluids. I sometimes had to resort to putting some bran into my yog or scrambled eggs when I was not eating enough fibre.
Personally, I would ditch the raisins and choc at 10pm. Banana, (not too ripe), with fresh/single cream, is sweet enough for me & much better I think? (Also very good for inducing sleep.) While raisins/choc chips are just all sugar and not much goodness in there I reckon?
I don't really think you have a full blown ED right now. You are just, (quite rationally), worried about gaining weight and not being able to lose it again.
But maybe you do need to loosen up a bit, as you shdn't need to be calorie counting all the time? (Just have a meal routine and listen to real hunger/your body's needs?)
Once you are pregnant, there's no need to eat a LOT more .... just normal amounts should be OK. But if you are slightly underweight at the start of a pregnancy, (and as you have been a higher weight in the past), your body might start 'telling' you to eat a LOT more calories, once you decide to listen to it. So only eat a little bit more, and make it something with good nutrient value. Also try to keep active eg walk a lot if you can. (To keep yourself lean/strong.)
It's OK, IMO, to keep weighing yourself regularly before, during and after a pregnancy, so you can see what's going on there. (Think that one shd be putting on about 10kg in order to give birth?)
And don't automatically panic if you put on more that 10kg. Just try not to gain too much in the 1st 4 -5 months. (Like I did!)
I think it's a good idea to check, (once you start to gain), that you are not getting fat all over, and only growing a healthy baby/bump. (You will be able to judge this I think if you stand naked in front of a big mirror?)
FYI, my weight has gone up and down throughout my life, as I always can put on weight v rapidly as soon as I eat too much/make poor choices. So I can understand why you want to keep control over your diet the way you do. (And that you fear that your appetite cannot be trusted.)
But right now, (in my late 50s/being more sensible), my weight is stable/the same as when I was 18, and it has been like that for about 20 yrs now, tho I don't do anywhere as much exercise as when I was 18. This is cos I have learned roughly how much I need to eat and what sort of foods to avoid. And I average out what I eat. (So I eat what I want but I try to make good choices overall.)
I am sometimes a bit hungry but I try to stick to my meal time and I never let my hunger get out of hand. (Tho occasional hunger isnt such a bad thing? Some ppl even think it's the key to a longer life?)
I feel my best at my current weight. (Nb Even a few kgs more makes me feel more tired/uncomfortable.) So this must be how I am meant to be? (And I can't imagine how it would feel to carry around a bag of 10/20/30 kgs more on a daily basis!)
For the record, my BMI is just 20. (At 60kg)
We are so VERY fortunate to live in a country of cheap and constantly available food, but the result is that most adults in the UK are now overweight and cannot go for more than a few yrs without food. So we must either learn to resist our natural urges, (and social pressure), to eat and eat, (and go for the wrong sorts of foods), or else risk ending up unhealthily fat?
It's always going to be hard to walk that narrow line between appearing food/diet obsessed and piling on the pounds with the majority?
Anyway good luck, as I can imagine how tricky this weight management situation is going to be for you in your life. But I think you will be OK, as long as you can relax the calorie counting/eat a little bit more? And I'm sure NHS staff will be far more worried about seeing an OBESE mum-to-be as opposed to a slightly slimmer one?
Wonder how much Kate Middelton weighed before she got pregnant? (Cos she still seemed to be able to give birth to 2 healthy-weight children?) The key must be WHAT you eat and what you DO NOT eat ... aswell as what's a normal weight for your build/how well you feel?