help?...

Kayla

well I took plan b one step on the 15th of March, bout 7 to 8 hours after the condom fell off, on the 19th I was supposed to ovulate but the 20th I started the spotting from plan b... this lasted from the 20th to the 31st... not my period was supposed to start on April 2nd. I am now 9 days late and took a pregnancy test this morning that came back not pregnant... so do you ladies think my period happened between the 20th and 31st when I was spotting?...