scared and confused

Staci
last month 1 day before my ovulation was to start I had a little too much to drink and me and my SO had unprotected sex, and he didn't pull out.. so I took plan b the morning after. now I have a missed period but I took a pregnancy test and it was negative. I continue to have symptoms(morning sickness, super tired, soreness,etc). what should I do? am I pregnant?