Anyone’s baby measure a week behind?

Had my first scan yesterday and was supposed to be 6 weeks 5 days however they said baby measured slightly smaller so I may actually be 5 weeks 5 days (6 weeks tomorrow). Did anyone else have this? I saw a heartbeat which definitely helped the anxiety a little bit. I cried A LOT! Happy tears of course! Friend of mine said she was always told her baby was smaller in every scan however he came out bigger than expected. She also thought my bubba looked fairly big in the scan. This is baby number 1 after 5 early losses🤞🏻🌈 so all of this is new to me!