From about 24 weeks I think. Then the number of centimetres from your pubic bone to the top of your uterus is supposed to be roughly the same as the number of weeks you are pregnant. I think they allow for a couple of cm's either way though.
Don't think it's that accurate, as mine's always been over! lol At 32 weeks I measured up at 38cm!
i started getting measured from 28 weeks & its surposed to measure roughly the same as how many weeks you are give or take a couple of cms each way ive always measured exatlly to the amount of weeks i am . violet xx
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