“Can I be pregnant?”

So I had my period November 7th-11th. My partner and I met up and had unprotected sex on the 28th of November. Since I have gotten home, I have had intense nausea spells (especially after I eat), severe fatigue (and yet also insomnia), increased appetite, slowed bowel movements, headaches, and increased urgency to pee. We THINK I had a light period (it was abnormally light for my body) on December 7th (It was earlier than predicted, didn't last as long as it was supposed to, and was very on and off) and after that was over, I have continued to have the same symptoms. I took a pregnancy test on the 8th and it was negative and then one on the 12th which was also negative. My partner believes I took them too early.