early pregnancy symptoms?

So lately I been Very nauseous Cranky Irritated more than often on and off headache Sleep pattern all messed up sore nipples , & on and off little cramps that just started yesterday (the cramping)

My period using starts on the 21St but last month it start early the 17th , my glow say my period should come the 19th month though I have sex twice during my fertile days .. the only thing confusing me is that I never been this nauseous ever or had headaches like this before .. anybody have or had this same experience?