I Had Unprotected Sex On 24th Of December But He

I had unprotected sex on 24th of december but he just put it in my vigana for like 5 seconds.. then the first of january we had protrected sex and the next day i took plan b and i should have my period on the day 8th but it says your period could come late.. but ive been getting headaches and bad cramps and milky white stuff out of my vigana like implatation bleeding.. Could i be pregnant.?