Uh body?

So I've felt nauseous at random parts of the day for no apparent reason. I'm tired ALLLL the time even if I slept for several hours the night before. I've usually got a headache and I'm shivering all the time. I don't know why I feel like this suddenly. I mean I've had unprotected sex daily and he finishes in me and im not excluding the possibility that I could be pregnant maybe? Ugh I don't know. I hope so but hope not. I don't have any other symptoms but then again I also don't fully know what day I ovulated on. Is believe it was around the 3rd though and have felt sick randomly since then. I know I can't instantly get pregnant the day I ovulated. I have to wist a few days but it's the 9 th now.