Its normal for babies to measure ahead by a couple of weeks. It doesn't necessarily mean your due date is wrong. My son was measuring 32 weeks at 30 weeks. Then at 35 weeks, he was measuring 36.
It happens a lot. Its normal to be measuring ahead or behind. You should have asked ur doctor if it's normal instead of coming on here. They could have giveen u the same answer instead of worrying about it.
Your about 5 months and maybe back in jan.