What Causes Lower Abdominal Pain And Thrush After Having Unprotected Sex?

I am 27 Year old girl.I had unprotected sex with my boyfreind on 31st December 2011 after 8th days from my period started(24th December 2011).3days after inercourse I experienced pain in my lower abdomen.Today I am getting thrush and spot?Is this a sign of pregnancy??But my boyfrnd discharge his sperm outside my vagina plus I have regular period in the interval of 28 days.But I am afraid of these symptoms as I dnt want to be pregnant now.Am I safe??????What may be the probable reasons of these symptoms...One more information,we also had sex one week before my period started?//