How do you know if EC worked?

[XBabyDollX]

I started my period three days earlier then the expected period day but my period has been weird. It started of with pink spotting then became heavy for three and a half days. I say three and a half because in the evening during the third day my period became light almost like it wanted to stop like at the end of a period it stayed that way till the fourth day it was only brown. Till the evening of the fourth day it began to bleed again it wasn't heavy just medium to light. I have never really experienced that where it stops for that long then bleeds again. Then on the Fifth day it had a mixture between red and brown then at the end of the day just brown and slowing down as it normally does towards the end of the period, but I never had a mixter of red and brown before. And now on the 6th day it is just brown and stopping like it normally does because it only last or 6 days. Just been concerned with the weird flow and color the other days. Is it normal for that to happen after EC? I did not take Plan B I took the Take Action Emergency pill, but how do you know if EC worked. Thank you for your time in reading this just advice please.  I have took so many test all were negative so not sure f I am just paranoid