Breast Flattens out when Laying Down

I am very pleased with my results, it seemed to even out my body which was my main goal in surgrey. My only fear is something is wrong with my implants.

I had my breasts augmented in January of 2008. I have saline under the muscle, not to sure on my cc's but overall I'm very pleased with the results. My only issue is my left breast seems to sit lower then my right. It's very obvious when I lay down, it lays drastically to the left. I want to make sure if its normal, or if i need to get it checked out.