Yung brown spotting after three months postpartum while breastfeeding ay pwedeng normal talaga, lalo na kung may sexual contact kayo, ang uterus ay still healing pa, so spotting isn't unusual, pero better check with your OB para sure kung it's just lochia or may iba pang reason. Maraming mum friends ko nag-experience din ng ganyan after resuming intimate activities, pero since you're also starting Daphne pills ngayon, good idea to confirm with your doctor na safe lahat and walang complications, especially since you're exclusively breastfeeding pa.