Hey, I'm new to blitz chess just wan to know if I have capturedd more pieces of opponent but my time gets over first.. Do I win or lose?
You've lost, I'm afraid. You lose if you're checkmated, you resign or you go over your alloted time. All regardless of how much material (number and value of pieces) you have captured. The value of the pieces is purely a heuristic guide to how well you are probably doing but the amount and value of material you have or had compared to your opponent don't mean doodly squot if you're mated or your time is up (assuming you are playing blitz or another time-controlled version of chess).
That is generally true but you can also get a draw if your opponent doesn't have sufficient material to mate.
A 1743? As I write, 100 below you exactly and my rating exactly!
Yeah, just about. He is actually 1786. But my rating is due to rise again. After a couple of games i am due to win. One is an interesting king and pawn end game against a lower rated player, whom admittedly has played rather well. It emphasises my point nicely though.