So I had intercourses on February 9th and I took a plan B February 12th. Well on February 18th I got my period or what I thought was a period a little early and it lasted 6 days which is a little longer than usual. Well today I feel nauseous and concerned of pregnancy like motion sickness nauseous and I’m not usually nauseous like that. I’m 100 percent positive it was a period but just been sleepy and tired and nauseous. I’m not late my next period is in a week or so but idk his plan b works like if I bleed am I in the clear?