What is it that your DH doesn't like about the Ergo? If he likes the general 'concept' of the Ergo but it's not a good fit for him, there are other SSCs (soft structured carriers) that you can try.

Do you think that the reason that you are having problems carrying at the moment predominately because you are pregnant? Ergos and other SSCs are not really good for wearing during pregnancy as the waist band digs in, they are also really hard to get comfy worn lower as your centre of gravity changes. Although I haven't yet worn a child whilst pregnant, I know people who find greater comfort with woven wraps, mei tais, or onbuhimos (Japanese carrier similar to a mei tai but with rings where the waist straps would be that the top straps loop into), which can all be tied above the belly for less restrictiveness. If wearing on your back, I think that you want to get your child as high as possible, as this balances your centre of gravity.

If you can give a bit more info about what your DH doesn't like about the Ergo, then it will be easier to recommend something!