Could I be pregnant?

Okay, I had protected sex on the 21st of September, three days before my ovulation period, which ended on the 1st of October, it is now the fifth of October, and I have resently began feeling more nauseated than normal, and have been extremely moody. I also don't tend to eat more than twice a day, and I get little sleep at night, but sleep on and off most of the day. So that could be contributing to that. I am supposed to begin my period on the 14th of October, and I am already spotting, and when my boyfriend and I "foreplay" I bleed. I am aware of the fact you can still "spot" when you are pregnant. I am begging to worry that something might be wrong. Can anyone help?