You have lots of wonderful advice here that will hopefully help you make a decision that sits well in your heart. One thing you have brushed on may need to be an important deciding factor for you and what you want.
You mention you run your own business, have I read correctly that this has been running at a loss for 4 years? That you and your husband's income from jobs keeps the business running? Staying with your husband or doing it alone, if you decide to keep this baby, giving up your business may be a sacrifice you need to make (or something you at least put on hold). After 4 years I would expect a business to be starting to turn a corner in terms if profitability. I appreciate that this is a dream of yours - my DH just had to shut down his own 'dream' business as it just wasn't financially viable, no matter what adjustments we made it was costing us money, not making us money. With me needing to stop working/reduce hours due to having our second child my income could no longer cover his business losses and he had to sacrifice his dream (in a way, for our child).
I don't mean to complicate things further, just think this is a factor that should weigh into your decision.