Calla Lilies

About a month and a half ago I saw potted calla lilies at the grocery store. I was extremely tempted to buy one. Calla lilies are my favorite flower. A few days later I discovered a really cute pot which came with potting soil and a calla lily bulb for the same price as the potted calla lily at the grocery store. I was super excited! I purchased the cute pot and planted my bulb. I read up on care of calla lilies. According to the sources I read, caring for a calla lily is quite easy. I'm wondering if I'm doing something wrong. It's been about 6 weeks and my bulb hasn't sprouted! I can't wait until it sprouts! It will be beautiful and will add a lovely accent to my decor! :)