my new baby !!!!

AbGo

my baby 14 months .. and now i afraid if im pregnant ?! im breast feeding and i dont have menses since delivery .. except last month i hade 2 times menses in one month suddenly without any minimal pain ... now i feel cramping pain in lower abdomen its like burning pain with back and bilateral thigh pain .. and i feel generally tired and body ache ... i did pregnancy test 1 week after intercourse and it was negative .. i should repeat the test but now is my symptoms mean im pregnant ? .. and when i should repeat the test if i dont know the menses time exactly !