You might be but it doesnt sound likely. Pregnancy spotting typically occurs 5-10 days after conception and a women ovulate 10-14 days before she gets her period. In other words, if your period is due in 11 days (and you have a regular cycle), its unlikely that you ovulated 5-10 days ago.
The spotting could be from ovulation bleeding or from vaginal irritation.
Anytime you have had unprotected sex you could be pregnant. No one here can give you that answer unfortuantely. I suggest a home pregnancy test might be the best way to tell when you miss your period. Good luck.