Early Preg

Hi, I'm a 23-year-old woman needing some advice, and I'm hoping you can help.  My last period started on March 17th, which was a couple days early.  Usually it is very heavy, and I go through many tampons on the first couple days.  This period was very light, with only one visible, however small, clot.  Usually I have much bigger clots for a couple days.  The blood was lighter, mainly a light pink.  It started out as a brown discharge, and also ended as such.  My breasts hurt like normal.  Earlier in the month, around ovulation time, I had cramps, which I usually don't get (though I get some discomfort usually).  My breasts are no longer sore like with my period, but I have been getting slight pains in them.  I have a creamy white discharge today.  I've also had some spouts of nausea.  I don't know if it could be all in my head, or could I possibly be pregnant?  What are the chances?  I had unprotected sex, but my boyfriend puts a condom on a minute or so before anything happens.  We only used the pull-out method once.  From what I've told you (hope it's not too much info :), what do you think?  Any advice would be greatly appreciated.  Thank you, Jennifer Tweet