I've lived in the US, have many friends there, and work in international education, so know of lots of people's experiences of moving to and from the US.
As others have said, you need to look really carefully at the conditions of your husband's contract.
Health insurance is most people's major monthly expense. Yes your husband's company will provide it, but what a lot of people don't realise is that you still need to pay every month for this. I've got friends working for huge firms in the US with access to great health insurance with comprehensive coverage - but they're often paying between $700-900 per month for their copayments. Their salaries might be higher on paper than UK salaries, but once you factor in the insurance, the salaries become much more comparable.
Property taxes can also be very high in some US states. You will need to check this when you start looking at areas to live. It's not like Council Tax - some people are paying thousands a month in property taxes depending on the size of their properties.
You also have to bear in mind that you have to pay tax at the end of the tax year - both federal and state - and you will need to put money aside for this as PAYE does not exist in the US.
You will also need to see if you are able to work on your husband's visa. If not, this could end up being a problem for you. If this is a long term move, then you'll have to wait years before you can work. You might be ok with that if you're planning on using this as an opportunity to be a SAHM, but if you want to keep up with your career, you may be prohibited from doing so. I know a lot of trailing spouses who have found this restriction on their professional lives really hard.
State education in the US is hugely variable and many international families will want to go private. These fees are very expensive in the US and many private schools in midwestern states will be Christian - and deeply so. So, check out schooling very carefully. You also have to bear in mind that the US curriculum is not as rigorous as the UK one, and if you're planning on coming back to the UK and slotting your kids back into the British system at some point, they may well be a year or so behind.
Moving abroad can be a fantastic adventure and the US has plenty to offer in terms of quality of life and access to amazing landscapes and experiences. However, do bear in mind that in the current political landscape, as a woman of childbearing age, you need to understand fully what you will be walking into and what restrictions and dangers you may face as a result, and be prepared to live with the consequences of that choice.
Something that also surprised me when I lived in the US was how deeply religion was baked into everyday life and how much of the communal social life in many places was built on church attendance. As an atheist, I found that really hard. People openly talked about religion at work and would invite me to church and so on. I also found it frustrating that some people made decisions at work based on prayer rather than common sense. It's a funny old country and in many ways can feel incredibly backwards and parochial once you get out of the major coastal cities.