kiki, I used to see Dr Adrian for my previous pregnancy which sadly ended in a mc. Dr Adrian is ok, very reasonable and cheap $550 for unlimited visits including ultrasound scans, vitamins, $800 for normal delivery, $900 for forceps etc...
But he seldom talks much and doesnt delve into many details... if he talks, he talks quite fast too. His machine might not be as updated as other gynae machine, think cannot allow you to hear/ calculate bb heartbeat but I might be wrong on that. But he is a very experienced gynae and many have delivered safely under him. There is a thread on him where you can gain more feedback from the mothers who were with him.
But if you will like to do a full checkup on your body, eg check ovaries, eggs, womb lining, whether O properly etc. Will advise that you go to a fertility specialist. 2 popular ones are Dr LC Cheng at TMC and also Dr LF Foong at Glenagles. But their charges are not cheap. One normal cycle of full monitoring with Dr Cheng costs me about 4 visits and close to $1k. But have you been ttc-ing long? If not too long, no need to see specialist at all. Normally most people recommend after 1 year.