Ah sis, relief muna na negative ang PT mo! Brown discharge lang usually old blood tapos biglang nawala, yan common sa exclusive breastfeeding talaga, ang prolactin from nursing talaga nag-suppress ng period, so parang gumagawa ng sporadic spotting lang bago bumalik ang regular cycle or parang ayaw-ayaw bumalik, haha. But since parang off ang pattern mo and you're still worried, mas better mag-check ka with your OB para sure lang and peace of mind mo, they'll just confirm everything's normal post-nursing at walang other stuff happening, kasi five days of spotting then nothing is weird enough to have a pro check it out.