Just trying to figure this out

First off- this not my first or second or even third baby- keep counting...

Secondly my LMP is August 3rd 2015- yes two years ago. I got pregnant while breastfeeding.

Now with all that in mind- could I actually really be further along in my pregnancy?? I don't trust my ultrasound tech- saw her at 20 weeks and she was just a bitch. I seriously doubt that I got the wrong EDD.

Here I am- healthy pregnancy, absolutely no complications whatsoever, very A-Typical (morning sickness, heartburn, I've gained about 18/20 pounds...my baby boy is super active, I take my vitamins and I eat healthy, I drink close to 2gl water a day.) But I'm "34 weeks" and dilated to 4cm!? Could I actually be closer to 36 weeks!? My babies typically come around 37 weeks....

I didn't have my period, idk when I even ovulated... I have been measuring a week and a half to two weeks a head.

I'm just curious about this and looking for some insight. I will be calling my doctor later (it's 5:19am)

Anything you have to say is welcome