is it a sign?

So for the past 5 days or so I've been feeling rather ill. I've been getting nauseous at night and it usually lasts until morning, sometimes into the early afternoon. I have no appetite and sometimes I even dry heave :( we haven't really been using protection and I also don't track my ovulation so I only really go off of my CM. Aaanyways, I was cleaning the bathroom and found a pregnancy test... my period is due today but so far , nothing has come.. should I take the test?! I'm almost too nervous to take it. I feel sick just thinking about it! Lol