Looking as to why bitcoin is down
Is a usual trading pattern for currency market and including cryptocurrencies. It fluctuates to push people in and take people out for profit

It happened last year too but basically stayed bullish through out the tail end of last year, so we should expect a proper correction that will settle the market for another run.
Meanwhile, bitcoin has shown to be a very promising coin and withstood the pressure of shielding off to $11 thousand plus till now. Is going to rebounce soon when all the Asian news settles down.