Breasfeeding should not affect a pregnancy test. If you became pregnant and took the test four weeks after making love, the test should have been positive. Most urine pregnancy tests are accurate by the time your period would be due (or two weeks after conception).

It is not uncommon for nursing mothers to remain period-free well into their baby's second year of life -- especially when still nursing frequently, both day and night. Frequent feeds at your breast can suppress ovulation and delay the return of your menstrual cycle.

Do you feel pregnant? Symptoms of pregnancy are usually not different for nursing moms, though they may experience increased nipple tenderness, beginning as early as two weeks after conception.

If you feel like you're pregnant, and home urine tests are negative, it would be wise to visit your health care provider. Pregnancy tests, including the blood tests, are not infallible. I have worked with several women who were positive they were pregnant, though urine and blood tests indicated otherwise ... and the tests did turn out to be wrong. Best wishes!