Too early for pregnancy symptoms???

Kallye

I am 7 dpo and it's still 7 days until my period is supposed to arrive. Is it too early to be experiencing pregnancy symptoms??? I've been super tired all week, HORRIBLE headaches, crampy feeling, drinks that normally taste good are tasting gross, my lower back has been hurting and have felt nauseous a little in the mornings before I eat. Anyone else had symptoms this early and been pregnant? I normally don't get PMS symptoms this early.