Seen here is a pattern on the 4 hour that showed up as an alert in our Harmonic Alerts module:

Bullish Butterfly USDCAD Alert 4 hr

USDCAD 4 hr Bullish Butterfly

You can see that initialy the price triggered the alert and the pattern but took us into the next 4 hour candle before we got any kind of a bullish reaction.

As always when you trade the Forex market  with harmonic patterns you must not just use the formation of a pattern to enter off. You must use the price action to give you a guide to what is happening as most harmonic patterns are alerting us to either a price retracement or a trend reversal.