this is my 2nd ivf cycle, first chemical pregnancy at 5 weeks, i am 15 days post embryo transfer , had two embroyo transfer on teh 13/3/2012, since the 22/3/2012 i am having light to dark brown stringy discharge , did pregnancy test it was positive, it then settled for next two days, now again since the 26/3/2012 getting light brown (caramel) to dark brown spotting on panty liner and also when i wipe, settles towards the evening; did pregnancy test yesterday as well, it was positive. just need to ask you common cause of brown discharge.