The truth is that you will not know if the pullback is the start of a reversal or just a pullback (pause) and the trend will resume.
This is where you are going to have to make some judgement calls. A lot depends on the strength of the move, the magnitude of the pullback,what the sector is doing and what the overall market is doing. The past couple days there are pullbacks and resumes all over the place. I know some guys like to short the pullbacks with the intention if the position starts to rise and go against them and is about to break through the previous pivot high then will reverse position and go long. I prefer to put the trade on once it takes out the previous high. the price should not fall back below the pivot high price in any meaningful way. if it does then you might want to reduce some of your risk. pullbacks and trend resumption trades tend to be some of the best risk reward trades in the marketplace that i can see. IMHO