Look at any chart for any stock; this is normal. It's called a correction. Nothing goes up and holds. All stocks go up until they are over bought and then go down until they are over sold. During an uptrend, the over bought/over sold cycle follows a channel that rises. I'll post a chart later when I have more time.
It's normal. I expected the correction sooner. NNVC gained 42% in two weeks time. That is huge. There was no "significant news" PR just a lot of investors liking what they are seeing with the company and buying up cheap shares.
When Doc. FG presents his chart you will see that there is a science to "Over-Bought and Over-Sold" trends.