Typically, the linea nigra is something that will occur when a woman is pregnant, however, it is also something that is present all the time. It is a dark line that will develop that runs from the belly button to the pubic area.
This line will appear in response to hormones in the body. For this reason, it is possible for the line to appear even when a woman is not pregnant. The hormones in question will cause this line because they cause the body to create more melanin. When this happens, the line will appear.
Another reason that women may have this line when they are not pregnant is because it is possible that it never faded from a previous pregnancy. After giving birth, most women will begin noticing that the line begins to fade within a few weeks after giving birth. However, this is not always the case.
If you do believe that you are pregnant, it is best to talk to your doctor. While a pregnancy test is typically very effective, a blood test may offer different results. It is also possible that there are other things going on in your body that are causing your hormone levels to be out of balance.