I'm currently in my third trimester and found similar to you that pregnancy weight training programs are a load of rubbish and assume you can't how a dumbbell...
I've been weightlifting/crossfit for over 10 years and have stuck to my pre pregnancy program, and everything something felt too difficult or got uncomfortable I'd stop or switch to an easier variation.
So in my first trimester I was showing up when I could and working at 70% for weights, or if it was a CrossFit workout making sure I had 30s rest after each movement in a workout to catch my breath.
Second trimester I felt back to normal, so started pushing the weights again, doing heavier reps, but making sure I was breathing and bracing properly (breathe out for the exertion, not hold your breath...) it was part way through my second trimester I stopped doing more 'gymnastic' CrossFit movements, like toes-to-bar, sit ups, snatches etc as I found them uncomfortable.
Third trimester I've found a rhythm of squats, shoulder press, deadlifts from blocks for compound strength movements. Dumbbell press, rows, rdls etc for bodybuilding accessories. Ski-erg, kettlebell swings, wallballs, lunges, step ups, ring rows etc for CrossFit workouts. I've managed 100kg for sets of 10 on my back squat at 30weeks, and am planning to keep squatting 100kg (albeit for less reps) for as long as I can, but I love squatting, and was very proficient before pregnancy.
I really think it is see what works for you, we are so varied in exercise ability before pregnancy that it's hard to give general advice.
https://www.instagram.com/alexlachancetraining?igsh=M3NrZjA1eWhxMzVu is someone I follow on Instagram, she had twins a couple of months ago and looking back through her posts is great to guage what might be possible as well as potential scaling movements.