Im thinking about the same thing. I am nursing, and my luteal phase has been short because of it. Before i was ttc, it was at 8-10days. Once i started ttc two cycles ago, i took progesterone to be on the safe side.
This cycle, my third, i wasnt able to confirm O, so i started the progesterone late, on 5dpo (usually its 3dpo). B ut in the meantime, i got some spotting! (can start as early as day 5 apparently, even day4)
the thing is, it could be implantation, in which case, i dont need the progesterone so much because its already implanted.But...what if it was an early period. I freaked out because my LP has never been that short, and ds is nursing less.
So, to be on the safe side, i took the progesterone last night. Of course, the spotting stopped today.
But ill never know, unless i get the bfp, whether is was implantation or and early period.
if it was an early period, then i am in trouble :-)
I hope you get some answers, because im not getting any.