A.P.
You might try another brand of pregnancy test. The dollar store tests are not very sensitive, and didn't register a positive for me until I was almost 7 weeks pregnant. A pricier one (like EPT) is more sensitive to HcG, and will possibly give you an answer sooner. As far as the breastfeeding goes, keep it up as long as you feel like it. In a normal, healthy pregnancy, it won't cause a problem.