At 3 weeks 3 days I was more hungry, tired, crampy, and bloated. Good Luck!
Go see a doctor for a blood test. It's better and will be more accurate than playing "what if" or "am I" with symptoms. You can easily have them, and they don't have to mean pregnancy.
Scientists have proven that any "symptoms" that are seen prior to a missed period are not related to pregnancy as it is too early for the hormones to effect you.