They have apps where u can plug in the date of ur last period and it gives u an estimate. Mine was still wrong tho I was a week further than we thought.
Realistically though you won't really know till your doc measures. Those charts are also based off of a normal 28 day cycle so you could be less or more depending. My periods are longer so I tend to ovulate a week later so my babies are usually a week younger than what doctors think.
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