First time taking a pregnancy test

Im 19 years old. I’m with my first love. We had sex on the 13 and 14th of last month. A week after my period. I was supposed to get my period 6 DAYS AGO!!! I have been feeling nauseous, fatigue and getting anxiety because its my first time i miss my period. I took 2 pregnancy tests the first being 2 days ago and it was negative. Its the ones they do in the clinics. And another one again yesterday being negative. I have been having sex w him since may and its never been this different. WhT should I do ? !!