Could I be pregnant?

Hi,

I had last menstrual cycle on Aug 23 and had sex on Sept 5. A week later I started feeling tender breasts and bloating. I am actually feeling a little lightheaded all day long, have had some difficulty falling asleep, have had more appetite than usual, have a pressure on my lower abdomen and feel my pants tighter in my waistline. I also have light headaches.

Could I be pregnant?

Thanks!