Sayang, this needs urgent doctor check, please go to your clinic or hospital today, okay? UPT positive tapi scan tak nampak kantung needs proper assessment from doctor, bukan boleh tunggu-tunggu. Could be timing issue, could be something else, only doctor boleh confirm after proper scan and blood test. Don't worry too much first, tapi jangan delay juga. One of my mum friends had similar situation and doctor sorted it out quickly with proper check, so go lah today itself, eh?