I had unprotected sex on the very last day of my cycle which was 1/4/2014 and it is now 1/12/14. He didn't ejaculate in me but there still could be a chance that I am pregnant. My period usually lasts for 7 days and I'm not really sure about ovulation. I haven't really had any symptoms yet but I do tend to have slight back aches and I am tired just about all of the time. I tend to eat more but I really think it's all in my head. Should I take a test? It's nowhere near time for my period. Any suggestions?

After only 8 days, it would be too early for symptoms. Yes, pregnancy is a possibility since you had sex. You now have to wait to see if your next period to come as expected. The first symptom of pregnancy is a missed period.

Since my period is 7 days a week when exactly is my ovulation if that's possible to know?

That is impossible for me to tell you. To follow ovulation properly you need to chart you basal body temperature for at least 6 months.