Could it be??

My period is 2 months late. The last time I got my period was June 19. Only lasted for 5 days when normally lasts for 7-8. Took a test in the end on July and was negative. Thought I saw something and people say it was faint but I didn't pay much attention. Iv been having Lower abdominal cramping, headache extremely often, fatigue, my nipples are sore, and was feeling sick about 2 weeks ago. Could I be pregnant?