StarNight, if you really want to take earlier BT, can just go, asl ong as at least 14days liao. You can tell them you want to know earlier so that if preggy can get supports earlier. And that if HCG level is low, you wont mind doing the BT again since that is also their concern.
If you are already there, normally they wont chase you home but if go on Sat may not know result till mon leh.
Actually i advocate early BT as if preggy, its always better to get supports earlier to sustain the pregnancy. Most pte clinics also do early BT for this reason. Like that more assured for us patients right? Dont understand why KKH dont think the same way. They also told me if test early must test again but i dont mind test again mah, can at the same time check for HCG doubling mah.