Filipino Passport holder staying in HK for 3 weeks, what to do?

I just want to ask what is the best thing to do. I am a Filipino passport holder and I booked my ticket to HK already and decided to stay for 3 weeks. Before I decided to stay for 3 weeks I didn't know that I could only stay for 14 days. Now what will the immigration tell me when I arrive in the airport? Also I am planning to go Macau as well and back to HK (maybe through ferry). Do I need a proof that I am coming out of the country just before 14 days and going to come back? I just need some assurance that I will be guaranteed to enter HK and go back home. Only intention in HK is for holiday. Nothing else. ANY HELP WOULD BE REALLY APPRECIATED.