ofcoz 做左先 la!! why do you need to 交代..? you are not born baby machine, you have right to choose what you do, so no need to 交代. if your husband 鬧 you, then i think he is not a good husband!!!
sorry if you don like what i said, its just my point of view.
I think you can check ultra sound first, because they can measure the head size of the baby. Usually if the baby's head is bigger than normal, it means there is a problem. My blood test for 唐氏綜合報告also 唔合格, but my doctor suggested the ultra sound first. The baby's head size were normal, so the doctor didn't ask me to 抽胎水!