Is Light Pink Discharge After Unprotected Sex, Sign Of Pregnancy Or Miscarriage?

I was about to start my period in three days and I had unprotected sex and my boyfriend came inside me, almost about day after that i started to bleed alittle pink and there was a piece of flaky pink what looked like to be tissue in the toliet after I peed , shortly after that i started what i think is my period. Is there anyway this could be early signs of miscarriage or pregnancy?? Please Help.