If you got whiplash watching the euro last week, you have good reason.
The common currency's wild ride higher after the European Central Bank meeting was such a sharp change from the doomsday talk surrounding the currency just six months ago that it left Andrew Busch, a currency strategist and CNBC contributor, "almost flabbergasted."
True, Busch says, there was plenty of good news for the currency to move on. "Everything broke euro's way, from Japan to you name it, and this is as good as it gets for the currency."
The rapid rally, though, leaves investors with a quandary: is there more room for the euro to run?
"Temper your expectations," says Kathy Lien, a managing director at BK Asset Management. "There's a lot to be worried about."