Preflop
Standard defend.
Flop
Overcalling with just a gutshot seem like a negative EV play to me. You are not getting enough implied odds to try to bink it on the turn, and if you miss, you cant call another bet. If SB had folded, your hand would be a candidate for check-raising as a bluff, since there are no really good draws on this board. But with a SB call, I would just fold this and move on with my life.
Turn
Given the effective stack size I do think, going for the dreaded donk bet would have been a great play here. When UTG got called by both players on the flop, he is unlikely to continue bluffing, and if you lead out now, you are not really representing much. Which is a great spot to be in, when you actually have the nuts. And if someone just call, you have an easy shove on the river.
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