A really nice 1:1 AB=CD pattern was just completed on EURNOK 4h. The only "warning" is the "fast" fall down to the D-point = Tight SL. RSI is oversold as well but the more restrictive can wait for it to break up over 20 (or 30 for those who use that). The risk is that you miss a large part of the movement. As always - your plan and what you have tested is what determines how you should take a trade.
For that reason, that is according to My plan in these conditions, I only place 1 position in this case - ie. half the risk of a "normal" trade with 2 positions.