I am sooooo sorry. I have no man, nor do I have much of a sex life *sigh*, but I do understand. At 1 point I did have both. It's hard for people who don't have bowel troubles to understand what we're going through. I think the most uncomfortable part is being intimate when you're bloated. It just hurts.
Not to mention, you're pregnant! I've never been pregnant, but I've heard that most "normal" people aren't even up for it in the beginning of the pregnancy. So really, you have 2 strikes against you right now. You should try explaining this to your husband. Maybe you'll get lukcy and he'll walk away with a Playboy (or something of the like) and leave you alone.
Here's a booklet (ibs explained for people who don't have ibs) you might want to pass to hubby to help explain how you're feeling.