38 weeks measuring 43 CM... doctor says she is big ? what does this mean ?

At my 38 weeks prenatal visit my doctor measured my belly and this time my belly measurements were 43CM meaning I'm a little big because the way he have explain it to me is that the belly should measure the weeks you're but in CM
Anyways, my question is what does this really means ? Does this means my baby is measuring as 43 week old ? I'm kinda confused 😐 

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