Would 3♥ be forcing? Let's say it's not, otherwise it's not so difficult.
Suppose you bid 3♠, would that lead to anything?
What about 5♥? Would partner make the right decision? How real is the risk of ending up in hearts when it should have been a minor?
What about double? Suppose partner passes, how bad would that be?
What about 4♥ or 6♥? What are the odds that you guess right?
Any creative uses of 2NT is this situation?

Help

(1♠)-2♦-(2♠)-?