Ugh mrsbumblebees exact same thing happened to me at 25 week check. Didn't see usual midwife, so walked in and replacement midwife looked at me and said 'sixteen weeks?'. Ummm, no. But thanks for making me worried and paranoid.
Not as bad as yesterday when I went for the whooping cough jab, nurse asked why I was there, I told her, she asked who had told me to get the jab so I told her it was the midwife, she looked at me and said 'oh, so you're pregnant are you?'. No, I am here for my own amusement because I enjoy pain. Plus I do have a bump, I do!!!!! But like you said, trying not to worry as bump has grown and movements are all there (in freaky 3D when she decides to move from one side to another...).
Got to go to a different hospital to get my anti d jab today, and replacement midwife wasn't sure if they were going to do a 28 week check whilst I was there, but 'not to worry because if they don't, just ring up normal midwife and you can book one in for next week'. When I am away for a wedding. Goodo. I really really really do appreciate the amazing job that the NHS do (I wouldn't be here without it!), but sometimes I do wonder how the organisation works!
Anyway, first thing my original midwife (I am losing count of how many I've seen and who's who) said was to step away from Google and never compare yourself to anyone else, as each pregnancy is different. So hope that is sage advice.
Oooh I have just had a really random and probably extremely stupid and naive thought. Please don't laugh at my ignorance, but is it the midwife you see regularly the one who is there at the birth??