Confused and frustrated

Taylor
So my fiance and I aren't completely ttc but we've said if it happens it happens. But Im confused and frustrated because he makes comments or remarks about being pregnant and saying ''that's what you will look like'' referring to a pregnant lady. But it's kind of frustrating because we both want a baby but he doesn't want to 100% completely ttc. I don't want to push the subject anymore then I already have and frustrate him. Could he be scared? Nervous?