Sleeping a large amount and sore breasts are classic pregant symptoms. Do not be surprised if your dr gives you a test. Those were my first teo symptoms for all of my pregancies... not everyone gets morning sickness.
I took a test when it first started and got a negative, but my pills been messing up my periods so I'm not sure if I would have been due on soon, although I think I'm late. I'm going to my doctor tomorrow because I've been sleeping loads and am always tired, but it's just gotten really bad today.
Oh are you seemingly not pregnant? As in you haven't tested but your breasts are sore?