Ok I haven't had a cycle since December 3rd. It was light and went away on the 5th, I know I'm not that far along, Late January I had some problems going on went to my primary he swears he thought I was pregnant but test came up negative. February around the mid of the month I started with being extreamly sick and going through a horrible time. I went to the ob she said my pee came up negative and she thinks it was a cyst on my ovary. I continued to be sick and then found out April 4th I was pregnant. First ultrasound showed 4 weeks. But then found out it was off by a month. Now my baby has grown bigger then she should be and I'm only supposed to be 5,months now. But everything I'm going through is a month or so further which is when I originally thught I got pregnant. Even the doctor said its hard to tell when it hapend because I never had a cycle. I was in 2 car accidents and was on things that could have stunned her growth early. Is that a possibility why she's starting to grow so quick? Could I be further then what we think? Im also going having really bad pains similar to bracks and hicks. And I'm now on bed rest because she's already trying to pop out. What could all of my possibilites be?

It is possible to get false negative and possible for estimates to be off. Best guess is often up to two week off. But yes it is possible it may be a month or more further along.