What Causes Pink Vaginal Discharge After Urinating?

hi just a quick question...everytime i go for a poo and wipe the back it is normal but when wipe my vagina i see light pink on tissue looking like it does when one is about to start their periods. it never happened before i finished my periods 2 weeks ago so why this happening?? only when go for poo it does when urinate only and wipe my vagina it is normal.