As early as a couple of days following conception, you may begin feeling nauseated and queasy.

A missed period is the surest sign of pregnancy in a woman of childbearing age who usually has regular periods.

If you're pregnant, your breasts will probably become increasingly tender to the touch.

Blame it to the raging hormones, most pregnant women start experiencing extreme mood swings and irritability during early pregnancy.

Another early symptom of pregnancy is a heightened sensitivity to aromas. Even a favorite aroma, such as the smell of a food or perfume, can make you gag.

If you start liking or disliking some food all of a sudden, you can suspect that you are pregnant. Some women say they have a metallic taste in their mouth, others that they cannot stand the taste of coffee, tea, or a food they usually like.

If food cravings are accompanied by some of the other symptoms on this list, it may be taken as a sign of pregnancy.

If the skin around your nipples (areola) gets darker, you may have successfully conceived. Though this may also signal a hormonal imbalance unrelated to pregnancy.

Once the embryo implants and begins producing the hormone human chorionic gonadotropin (hCG), one may require to visit the bathroom more often and this is taken as an early sign of conception.

Feeling tired is a hallmark of early pregnancy. High levels of the hormone progesterone can make you feel as if you've run a marathon when all you've done is put in a day at the office.