Don't worry if your connection is lost after you place your bet. Your bet is still valid.
Since the game is live, the particular round might have ended by the time you reconnect. If this is the case, the system will automatically assume that you have selected the "Stay" option and the game will continue as usual.
In order to check the game result, you can click on "Game History" or the "Clock symbol" on the game page if you are in a live casino lobby.