NL25 33 Full House on the River

[HighCardSeven]

Poker Stars - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $15.45
BB: $20.90
UTG: $22.20
CO: $54.10
Hero (BTN): $25.55

Preflop: Hero is dealt 3 3 (5 Players)
UTG folds, CO calls $0.25, Hero calls $0.25, SB calls $0.15, BB checks

Flop: ($1) 3 4 A (4 Players)
SB checks, BB checks, CO checks, Hero bets $1.00, SB folds, BB calls $1.00, CO folds

Turn: ($3) J (2 Players)
BB checks, Hero bets $2.00, BB calls $2.00

River: ($7) 4 (2 Players)
BB bets $3.50, Hero ???

What should I do? Is a reraise the right answer? If yes how much should I bet? Is calling to weak? Maybe he has made a higher Full House on the River. He is the BB and I was not sure if my pocket 3s are strong enough.