had unprotected sex with the boyfriend in the middle of the night when we were both drunk. immediately the next morning i went straight to the docs to get the morning after pill. followed the instructions and took it. 8 days later my period came and was heavy to normal flow. however just a few days ago, i realised i a lactating?! i took a hpt but it came out negative. am getting verry paranoid now! can i be pregnant???