Hello Thanks for writing to us with your health concern. As you are combined breast feeding plus supplementing feeding, there is a possibility that you might have ovulated after childbirth. Actually only exclusive breastfeeding is somewhat reliable as contraceptive. Sometimes, after birth, women do ovulate even without a period. I do not understand what is meant by a faint negative line. It is either negative, or positive, could be faint positive, but there is never a faint negative, because negative implies NO line ! Can you upload the picture of the test taken by you at - http://doctor.healthcaremagic.com/doctors/dr-aarti-abraham/64623 If you have conceived, and wish to discontinue, you would have to consider medical abortion pills. That is after consulting a gynecologist and having an ultrasound scan to confirm and date your pregnancy. Take care.