Pregnancy Test Question

The last time I had sex was about 6 weeks ago, my boyfriend recently moved. I took a pregnancy test to make sure (I recently started bc that cause random spotting but basically prevents my period). So, I got two negative pregnancy tests. I know I took them correctly, and I used a reliable brand. Is there any possibility whatsoever that I'm pregnant?  I know it's next to impossible I just need some peace of mind. Thank you!