I knew I was pregnant at implantation and I felt that we had conceived 6 days prior. It was weird. So I was just sitting waiting until the test turned positive. I didn't even test but twice (once a little too early then again at 12 dpo) because I just knew. My earliest where headaches, nausea, and peeing a ton. I started getting pulling pains in my pelvis early too. I've started getting emotional at stupid things too. During week four I had sore nipples, but I'm breastfeeding, the nausea got worse, and smells and cravings started. Now at six weeks all those symptoms are amplified and my breasts are huge and hurt bad. I am also getting sore really easy, just by walking around my pelvis feels like it's out of alignment, which I had all throughout my last pregnancy too, just not this early. Every person and pregnancy is different. The rush of hormones effects women differently. For you, your symptoms could be perfectly normal.
Oh and the tiredness, yea...I can't stay awake for very long. Just so fatigued and tired.