I am with frugledoc, near the start of accumulation you want things to be as cheap as possible. It is those who are near FIRE, or beyond, where drops are not wanted. Don't fret about it, continue putting money in and remember you are now buying the same future cash flows for less money. This drop has only given back a couple of months of ridiculous excess so really it is nothing and as such could easily go further (or rally back, or stay flat). I have worked in financial markets for 20-years and trust me when I say - no-one knows!