This seems like a pretty risky and unusual strategy. I mean this very sincerely, but what's your thinking behind this?
Because you're investing in a Roth IRA with money you've already paid taxes on, you basically have to earn more than $5,500 in order to have $5,500 in hand. If you're in the 25% tax bracket, you had to earn $7,333. And then, on top of that, you're paying 4.59% interest. I know you said you'll pay it off in a few months, but whatever -- you're paying interest, effectively adding to the cost of that $5,500.
If you can pay off the loan in a few months, why not just save the money from those few months and invest it as you have it? The market is on fire right now, and while I strongly urge against any attempt at market-timing, it's not like we're bottoming out and these low prices won't last. Quite the contrary.