flopped bottom two pair on a drawish board in a multiway pot

[PartyPaul]

Button is a 38/6/2.5

Cryptologic
Limit Holdem Ring game
Limit: $2/$4
6 players
Converter

Pre-flop: (6 players) Hero is SB with 8[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/spade.gif[/img]
UTG calls, UTG+1 calls, CO folds, Button calls, Hero calls, BB checks.

Flop: 6[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (5SB, 5 players)
<font color="#cc0000">Hero bets</font>, 3 folds, <font color="#cc0000">Button raises</font>, <font color="#cc0000">Hero 3-bets</font>, <font color="#cc0000">Button caps</font>, Hero calls.

Turn: 8[img]/images/graemlins/spade.gif[/img] (6.5BB, 2 players)
Hero checks, <font color="#cc0000">Button bets</font>, <font color="#cc0000">Hero raises</font>, <font color="#cc0000">Button re-raises</font>, Hero calls.

River: Q[img]/images/graemlins/spade.gif[/img] (12.5BB, 2 players)
Hero checks, <font color="#cc0000">Button bets</font>, Hero calls.

Results:
Final pot: 14.5BB

I should fold pre-flop, but I'd like to focus on the flop and turn. On the flop I bet to protect my hand. Since open-ended straight and flush draws aren't going to fold here, I should have checked. Then I reraise for value, since I think I have the best hand. When she 4-bets, I think she has either a straight, a combination of a open-ended and flush draw, or trips. So I call here. On the turn, I think it's more likely she has a straight or draw, so I raise. When she 3-bets, I'm affraid for a higher full house, so I call it down.