Every woman is different. So are her experiences of pregnancy. Not every woman has the same symptoms or even the same symptoms from one pregnancy to the next.
Also, because the early symptoms of pregnancy are often like what happens right before and during menstruation, those symptoms aren't always recognized.
A few days after conception, the fertilized egg attaches itself to wall of the uterus. This can cause one of the earliest signs of pregnancy -- spotting and, sometimes, cramping.
That's called implantation bleeding. It occurs anywhere from six to 12 days after the egg is fertilized.
The cramps resemble menstrual cramps, so some women mistake them and the bleeding for the start of their period. The bleeding and cramps, however, are slight.
Breast changes are another very early sign of pregnancy. A woman's hormone levels rapidly change after conception. Because of the changes, her breasts may become swollen, sore, or tingly a week or two later. Or they may feel heavier or fuller or feel tender to the touch. The area around the nipples, called the areola, may also darken.