Sometimes MTP kit
does not completely evacuate uterine products of conception and slight discharge may continue for several wk/days depending upon gestational age
Do a USG pelvis to rule out underlying pathology/retained bits of conceptional product if any. Then consult with your gynecologist and may need D &C for complete abortion
Practice safe sex by using safe period/OCP/Condom etc to avoid unwanted pregnancy
& unnecessary vaginal bleeding.