I'm 27 and my period has always been regular since I got it at about 14 never late or anything unless I was pregnant I am not on birth control but within 2years I have taken 5plan bs(all spread out) after taking them my first period is 2days early or 2 days late then goes back to normal. I took my 5th plan b in may had a period in July that started 1day early but other then that was normal then my period this month is now 4days late(which has never happened except when pregnant) I had a little bit of pink blood this morning but went away I took 2pregnancy test the first didn't do anything and the 2nd said negative. Has anybody taken a plan b and then it made their 2period not come but got the first one. And when I took the plan b it was right in the middle of my fertile window. And we have had sex after that period had came