trick or treat ? how scary is this hand?

[redbeard]

party 3/6 6 max:
preflop:
one fold, utg+1 raises, two folds, hero in sb w Ah Ac three bets, bb calls, utg+1 caps, hero calls, bb calls pot: 12sb.

flop: Ad 6c 7s
hero bets, bb raises, utg+1 reraises, hero caps, bb calls, utg+1 calls pot: 24sb

turn: 4s
hero bets, bb raises, utg+1 three bets, hero caps, bb calls, utg+1 calls. pot: 24bb
(at this point, i capped the turn given the preflop action believing bb to have a set and utg+1 to be overplaying KK or possibly a set too, or maybe the best chance is AKs that flopped top pair and picked up a flush draw.)

river:Js (BOO!) (i'm scared)
hero checks, bb bets, utg+1 calls (have i dodged the runner-runner flush draw or does the bb have it? oh well, its only one bet and with a pot of 26bb i gotta call) hero calls.

RESULTS: bb and utg+1 split the pot w/: 8 5 off (wtf!)

QUESTION: if the river had gone hero check, bb bet, utg+1 raise is this a clear fold? what if the river had been the Jd instead? (i think i would have had to lead out the river and called any raises in that case). Let me know what you think.

Anyway Happy Holloween.