Nothing happen imo, just normal fluctuation in bitcoin world.
Bitcoin ATH is $7831, after reach the peak, bitcoin got corrected because people cash out their investment just in case bitcoin price will drop significantly, or just want to make profits. But, look at current price, recover to $7200.
You've bought BTC40 at $7500, that's a huge investment. Are you planning to trade bitcoin in the near future? Or want to hold it for long term?
No need to worry about it due to bitcoin will always recover, but it may take a day, a week or a month. Just hold it as bitcoin may reach $15,000 in 2018.