Pls I need help ...I took post pill on the 17th while my period was due for 21st. , I think I got an immediate side effect cause I bled for 3 days but on the 4th day it seemed like real period (this was on the 21st of april) this lasted till 26th .I then had unprotected sex till 30th and used post pill after. May 9th I got a 3 day bleed (which I think is a side effect of the post pill) was expecting my next period to be 21st of may as usual buy then on the 18th of may I got light spottings , first started off as brown and now it's like red with clots in it ( sorry for the gross detail) don't know if this is my period because it is really light. I have take loads of test ...all negative .took one yesterday ie 21st of may, still negative. Pls what do you think , is the light bleeding my period or is it something else.