Been nauseous for a week

I have been nauseous every day for the past week. I took two tests and both were negative but my period isnt due for another 5 or 6 days. I started feeling this way only 4-5 days after ovulation. Is it possible that I am pregnant and started feeling sick almost immediately? 
I am TTC #1 so it is all new to me! This is our 4th month actively trying.