Plan b and I’m 12 days late😫

I had sex nov.3 took a plan b nov.4 threw up the day after I took it And was having horrible symptoms that whole week. Nov.12-Nov.15 I had spotting the week after that I started throwing up again had sore nipples stomach pain felt light headed and was extremely hot. My period is 12 DAYS LATE and I’m not having any period like symptoms.i Took tests earlier while everything was happening came out negative. Could I be pregnant?😢