The butterfly feeling in your tummy can't possibly be a baby. You won't feel that until the second trimester. The sore breasts could be a sign of pregnancy. But rboh is right, to early to test. I always waited until my period was a couple days late.
It is definitely too early to find out but no necessarily too early to have some symptoms. i too experienced some symptoms as early as 5 days past ovulation and I am pregnant now so good luck to you =) I would wait to test until you are atleast 10DPO.