I am breastfeeding; i do not get my periods. i have headaches, back pain, nausea, increased appetite, cramps, and i have become sensitive to smell. is it possible that imight be pregnant again?

Multiple symptoms: No doubt you could be pregnant even though you're breastfeeding. It doesn't confer 100% protection. However, if pregnancy test is negative and say a repeat one in 2 weeks is negative again, there should be another reason explaining these symptoms.

Nursing and pregnant: Possibly. Take a pregnancy test. If negative and the symptoms persist, you should see your doctor.

Possible: Breast feeding is not effective contraception. You need to check a urine pregnancy test.