do I go by the December or the last one in January

I would go by LMP if you know for sure when it was. I couldn't remember exactly and go by what my doctor decided. Then at 18wks they said my baby was a week ahead on growth, but they still kept my date the same. Unless it really differs by less/more than 9 days, they will keep it the same date. I still have the same date.

I thought I was further along than I actually was in the beginning but I was only 6 weeks 1 day when they gave me an ultrasound.

I 100% go by lmp. they tried changing it by one day and I refused hahaha. I make big babies though

@emily18234,

which would u go by

no, they'll do an ultrasound and change it if you actually are