Due date change last minute?!

Hello everyone, first time momma here. Has anyone had their due date changed on them last minute? I’ve had the due date of June27th my entire pregnancy and when I went to the doctor yesterday they said it looks like my due date could be June 15th and that makes the earliest I can deliver be as soon as THIS SATURDAY Considering the safe zone of 37-42 weeks! Has anyone had this happen before? I’m just in shock since things can now happen much sooner than planned. We had three due dates being thrown around (May 29th, June 15th, and June 27th) until I was about 24 weeks when things started settling at the June 27th date. With fundal height yesterday it’s reading more of the June 15th and I’ve been having a lot of Labor signs.