It is just a mere coincidence that Friday the 13th and bitcoin price dip was on the same day. Reality still lies with the fact, coronavirus outbreak all over the world.
Sure it was you can't just draw conclusion behind these dates especially when there is nothing event on that particular time. You could've compare the prices of bitcoin in the near coming of halving every four years, like price on March 2012, March 2016 and now just like creating and concluding patterns. There isn't that much affect of the Friday the 13th, so what if its Friday the 13th?