Its a bearish daily behavior to close in negative BB zone and touch lower band (which is nice daily support zone btw).
Also watch out weekly candle to close below upper BB.
So in this case price is usually doing a swing between daily 20 ma and weekly 20 ma. In steps:
1. Finding support not far bellow daily bottom BB band
2. Bouncing up back to daily 20 ma
3. Collapsing to weekly 20 ma
This is shown on picture.
Further bullish trend depends on whether price break down weekly ma 20 or not. Mid term trend is bullish as long as price stays in weekly positive BB zone.