There is no such thing as a blown hold.
A hold is credited to any pitcher who pitches in a save situation (lead of 3 runs or less or tying run on deck, and also not in line for a win) who maintains a lead but doesn’t finish the game. And if he doesn’t maintain the lead, as it was a save situation, he’s credited with a blown save. They can happen in any inning. A couple years ago, Ryan Brasier (still with Boston) was credited with a blown save in the fifth inning. It’s rare to see one that early, because more often than not, relievers pitching in the fifth are in line for a win and not a save. (It’s not real common to have a lead in the fifth in a game in which you’re on your third pitcher.) But BS are rather common in the 6th through 8th innings.
The abomination known as the ghost runner has lead to an increase in blown saves after the ninth, mostly when the visiting scores a single run in the top of the inning and a new pitcher enters the bottom.