Was this a bad river play?

[Ralle]

5/10 limit hold'em online. Two EP limpers, I call in LP with 44. Both blinds call, so we are five on the flop.

Flop comes 3 4 J, two spades. EP1 bets, EP2 calls, I raise. Both blinds fold, and both EP call.

On the turn comes a 6, putting two hearts on the board. Checked to me, I bet. EP1 raises, EP2 folds. I reraise and EP1 caps it. I call.

River is an offsuit T. EP1 bets, I call.

I thought a few seconds before I decided to call. There were three bigger sets possible, and two straights. I didn't really think he had TT or 52. But JJ, 66 or 75 felt possible.