Nervous 25+2

I have an anterior placenta an I'm due with my first at the end of September. Everyone keeps making me nervous saying I'm too small. Some days my stomach looks bigger and some days I feel like it just looks a little chubby. I measured normally at my 20 weeks appointment. I also don't feel a ton of movement because I have an anterior placenta. From what I've seen most people feel a lot by now even with AP. I'm getting worried. Any suggestions to stay calm?