Noticeable changes to him

Nikki • I am married and had our first baby in July 2016. He just turned 1!!! Our little boy has been the best thing we have ever done and I look forward to doing this again.
I was just wondering if anyone else has their husband/SO noticing a change during sex once pregnant. I'm 18 weeks and he says it's different. Didn't say a bad different, just different. Didn't think I would be "different" until after the baby came.