dating pregnancy with numbers e.g. 13+3


I was calculated as 13 weeks last Thursday but am getting a bit confused with the way you express this through the '13+3' thingy. Would I be 13+3 today (saturday) - i.e. is Thursday 13 weeks also including the '+1'?

Hope this makes sense - always been a bit confused about whether you actually count the +1 or miss off the +7



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