Downswing

I've been playing 1/2 limit on Poker stars lately and I just lost about 40 bucks in maybe an hour. Is this a normal downswing, should I expect this to happen or am I playing bad? I don't feel to bad about it as I lost most of it on good hands that got beat. Looking back I could of shaved of a few losses, I got in a raising war on the flop with KK against somebody who tripped his 44. I called him all the way down and lost two bets when I should of known I was beat. My other main losses were on QQ and 77, it just seemed like everytime I got a good hand it got beat on the flop. Much of it was lost on hands I raised pre-flop but had to fold after.

I just need somebody to tell me this is a normal downswing so I can get my confidence back. I just moved up from .50/1 and losing 40 bucks so quickly makes me think I should go back down.