Due Date Question

Okay ladies this might be a dumb question, this is my first pregnancy.

Is it normal to have your due date changed 3 different times?

My very first appointment where I had them do a pregnancy test, they gave me an estimated due date.

My next appointment around 6 weeks, they moved that due date up almost a week. I ended up not liking this doctor and went to a new one that I love.

My new doctor once again moved my due date up another week.

This may not seem like a huge deal but it’s driving me crazy having it changed so many times because I feel like I could expect him anytime within those 2/3 weeks time frame of all my due dates which ends up being almost the entire month of September 😩