With enough to invite over a 12-14 1NT rebid, partner would have bid his suits in a natural order; otherwise he'd bid spades first.
Over 2♦, 2♥ would have been any weak hand, 2♠ would have been a one-round force, and anything else would have been game-forcing (so we're forced to game now).
If you now bid 3♥, it's fourth-suit forcing, because you're English.
What do you do now, and what's your plan after partner's likely continuations?

Help

pass 1♣
1♠ 2♦
3♦