Diana, whichever you more comfortable with, can be KKH or Dr Tham, just bring the test stick and request early BT. At this stage if even HPT can detect, your HCG BT levels should be quite good already. Good to start getting pregnancy supports like more progesterone, folic etc ... Cos early pregnancies, bb grow very fast, additional progesterone support is good in case our own body cannot produce progesterone fast enough. Then it can help support bb to develop strong and well.
Dont be like me, last BFP, didnt take more supports and didnt take earlier, end up MC. Day before my MC, my HCG was very good and more than doubling at 4370 (i think, cant rem exact) but progesterone rock bottom. So better be kiasu abit.