LMP is never accurate even with a regular cycle so follow the ultrasound's date. You are probably or might be too early than 8 weeks hence you cannot see both yet cos normally by 8 weeks can see already. Be positive!
Have a positive mind. Normally at 8 weeks it can be detected. but there may be some possibilities it can be seen after that also. that is why your doctor has asked you to come after 1 week.
I'll try and stay positive. thank you for your kind words (:
Nurul Syaidah Ahmad