Hanoi-Hong Kong-Shanghai-USA

Hello. My trip is Hanoi-HKG-PVG-USA by air. Would like to stay for 3 days in Shanghai. Do I qualify for the 144 hr visa free in Shanghai? I received one answer already that I don't since I have a short layover in Hong Kong. Is this correct? I read that Hong Kong, Macau and Taiwan are considered third region for the 144 hr free transit. Please share your thoughts.

Thanks.