Holiday dress ideas??

I was thinking I would have a cute baby bump by now. But instead my waist is just thicker. Does anyone else have this issue? I’m too big for my regular dresses, but won’t fill out maternity dresses. I have a cocktail party to go to & no idea what to wear. Any ideas?

The baby is measuring right on track so I’m super grateful! Just confused as to why I’m almost 6 months and still not really showing. I’m a first time mom. Any party dress ideas would be really appreciated!