First sign of a baby belly

I'm almost fully in maternity clothes now except for some of my clothes that were too big on me. I don't think people that don't know me can tell, but people I work with talk about my baby belly all the time. Here I am at 15 weeks and keep in mind that it's the end of the day. My belly seems to grow substantially throughout the day....I'm assuming that's food related.
I don't sleep well so I think this is my permanent "pregnancy face" which just means I look tired all the time.
And one from the next day when I wasn't feeling so bloated....but yes still as tired. So very tired.