I took a plan b in September 11 then after like 7 days of taking it i started bleeding and cramping on September 18th-19th and now today my period is 3 days late and it was supposed to come on October 4th and i took a test when i was one day late and it came back negative. Could it be the plan b making my period late and should i get it next week??

I took a pregnancy test yesterday and when i took it in the bathroom it showed negative so i just put it in my draw and later at night it showed that is that a evapartion line???