Losing weight?

Probably overreacting here but I'm almost 30 weeks and noticed I have lost 3lbs. My belly also looks a bit smaller, even someone at work noticed and pointed it out. Is this normal? My eating hasn't changed. I have been using the restroom more often, few times a day, could that be it?

Did the baby just change positions? She's been head down since 20 weeks.

Anyone else?