Should I consider that I might be beat?

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) FTR converter on zerodivide.cx

MP ($28.65)
CO ($106.73)
Button ($24.55)
Hero ($19.55)
BB ($1.95)
UTG ($41.15)

Preflop: Hero is SB with A, K. Hero posts a blind of $0.10.
1 fold, MP raises to $2, CO calls $2, 1 fold, Hero (poster) calls $1.90, Hero checks, MP checks, CO bets $2.75, Hero calls $0.75, MP raises to $2, CO folds, Hero calls $1.25.

Flop: ($7.10) 4, A, T (3 players)

Turn: ($7.10) 6 (3 players)
Hero checks, MP bets $3, Hero calls $3.

River: ($13.10) 6 (3 players)
MP calls $12.55.

Final Pot: $25.65
Main Pot: $25.65, between MP, Hero and BB.

I was trying to look like I was buying the pot with the last bet.