Spotting before period??

Da

I’m not pregnant (at least I don’t think) but today I had a couple of little streak marks on my underwear and again when I wiped (sorry for tmi) this started happened when my period finally went back to normal after having my twins, I’ve also been extremely stressed lately. I have no other symptoms and a doctors appointment for later in the week. Does anyone have any advice or insight into what it could be?? Thanks ☺️