無早孕反應是否正常

No minor sickness could be very normal. Don't worry!
Of course some women have lots of minor problems like nausea and vomiting, but there are many many others who are very OK (like me). I have three children, only the first one felt hungry every one to two hours (at the beginning).
If your pregnancy test was positive on 23/1, by the time you go to see doctor, the fetus could be only 6-7 weeks. It may still be difficult to see it in the ultrasound exam. According to my knowledge, it is easier to see it if > 7-8 weeks. And doctor usually measure the crown-rump length at 10 weeks onward to decide the expected date of delivery. In case you cannot see the fetus on ultrasound exam next week, it does not mean anything goes wrong, but you should repeat the exam two weeks later. Also need to consider your menstrual history. If you have long cycle, the size may be even smaller.
I know many people who had abortion at the first pregnancy but the next time is fine.

Good luck and don't worry!

我去做產檢的時候都有問過醫生... 因為我陀bb初期好少嘔... 係咪唔正常... 但佢答我每個孕婦的早孕情況都唔同... 會因人而異... 就算有人無任何反應都係正常的.. 所以你唔洗擔心o架...

反而你要注意的係放鬆心情.. 因為過份緊張對初期孕婦來講係大忌... 而且仲要注意飲食... 休息多d.... 咁樣個bb先會健健康康o架嘛... ^^