Was 5days mate on my period was supposed to come on the 16th of Jan this month but came on the 20th was only on for four days it was lighter than usual but the second day it was a little heavy? Yesterday when I was coming of it was very discoloured (sorry for the detail just want to get an answer lol) it was a mustard colour, been having lower left side back pain hand wanting to eat more, but have gone of certain foods like they want make gagg..... My periods are usually regular always on time. I've taken 3pregnancy test but all negative? Somebody Help me!!