Could I be pregnant?

Autumn
Hi, I just wanted some other opinions.  I had unprotected sex with my husband several times this month.  The last 4 days my breasts have been extremely sore, and I have been really tired, wanting to sleep almost all day.  Today is the day my period was due, and I had mild cramps this morning, but only light spotting.  Now, my breasts feel only sore, and the spotting is almost gone.  I'm just not sure if this is a sign of pregnancy, or if my body is just out of whack this month.  Any comment appreciated!