I am planning to buy 1 BTC. Do I need to wait few more days for a price fall?
No you don't have to do that because if you are planning to buy some bitcoin you will help bitcoin to regain the price back and many people are just waiting for the kick. The price will all go down if all people will be thinking like this question.
Dude. Buying one full bitcoin is a lot of money. I think you should be able to decide about that on your own study and research. Because if you buy in because you believe in btc, then it doesn't matter if you buy in now. You're prepared for the long haul. If you simply depend on what people are going to say then you'd end up like the people who got rekt after the btc pump last december