Your about 5 months and maybe back in jan.
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.
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.