Since having my 3rd baby in November, once my periods came back (I did not breast feed so this was quite quick once the PP bleeding ended) I basically had a continuous very light period up until May, which lasted the usual 4 or 5 days then ended, my period came back on the 24th june, once again normal duration however quite heavy and painful. Now as of today I am 16 days late for my period which has never happened in my life ive always been early if anything. I took two pregnancy tests last week both negative so I know its no baby in there
but I just find it so strange. Should I be concerned? What could it be? Has my body finally run out of blood? 

