Worried!!!

My son, almost 3 told us we were having a girl this time around and confirmed we are...16 weeks yesterday. Well tonight he kept repeating 'Sissy went big-bye' We're nervous because my next check up isn't for three weeks and I haven't really felt any movement. Just a few flutters a few weeks back. Heard heartbeat a week ago. No issues. No bleeding, spotting, cramps etc. Gahhhh I'd feel so silly calling the doctors office and explaining that. They'd be like oh great crazy nut job on our hands...