Sex life? What sex life?

Edit: My sex drive decreased in the very beginning too but it's like the last 6 weeks or so I've done everything but beg for it! (I ain't begging). He seems perfectly content.

So I'm about 14 weeks pregnant. Before we got pregnant our sex life was fine, after all that's how I got pregnant. We were not tracking or stressing we just let it happen. Well almost instantly our sex life started to diminish first to weekly, then biweekly and now it's been almost a month!!! I'm already a bigger girl so I've been really worried about my weight. I've only gained 2pounds but it's all in my belly so far.

I've tried talking to him but he just shuts me out. Part of me feels like hes scared he will hurt me or the baby but another part of me feels its because of my weight. This is fourth pregnancy and things were not like this with out first two. I need advise!