I put on less weight with my second pg, a little more with my third. I am a healthy weight, about 5ft5in and around 70kgs. Doesn't sound to me like you are an unhealthy weight! Is your DH concerned about your health or your appearance?

If my DH expressed a negative opinion about my weight I would kick him in the shins!! No chance of another pg as there's no way he'd be getting any sex...