Possible pregnancy

I have recently been feeling really nauseous in the mornings and after I eat. I've also been having really bad headaches almost daily and feeling really tired and wore out. My boyfriend and I usually have unprotected sex so I know it's always possible but My period isn't for another week so I haven't missed one yet is it possiblethat I'm pregnant and these are symptoms? and if so when is the earliest I could take a test?