How early can symptoms show up?

With my first pregnancy, I didn't start to show symptoms (morning sickness and fatigue) until I was about 6 weeks. I just found out I'm expecting again, only 3.5 weeks, but I'm experiencing fatigue, breast tenderness, headaches, and feeling a little lightheaded/dizzy. I never really got cravings with my first pregnancy but I'm having them now, and I'm wondering if it's really pregnancy related or all in my head. Is it possible to experience these symptoms that early? 

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