a streak of (good) luck
A period of continuous good fortune. We've had a real streak of luck ahead of the build. The planning permission came through very quickly, the bank approved our second loan application, and the weather is supposed to stay sunny and dry for the next few months. With this refund from the IRS, it looks like my streak of good luck is still going!
streak of good luck
and string of good luck a series of fortunate events. After a series of failures, we started out on a streak of good luck.