early symptoms

Its been 8 days since conception and been urinating a lot plus nausea, bloating, gas, and a lot of eating. But heres the thing my cycle has not approach yet, but suppose to be this week. The other day I told my bf that I didn't feel right nor felt beautiful enough (which I found weird for me to say.) I would eat and eat and woulsn't get full, but today I was full for a little moment then got back hungry again. Can someone explain this could I be?? I know my body and i don't feel like myself. It couldn't happen this fast or could it?? One more thing i have been having lower abdomen cramps as well to where it would cramp on the left side of my stomach then start to feel it on the right.