Some of the early pregnancy signs/most common pregnancy signs:
Implantation Bleeding:
Implantation bleeding can be one of the earliest pregnancy symptoms. About 6-12 days after conception, the embryo implants itself into the uterine wall. Some women will experience spotting as well as some cramping.
Delay/Difference in Menstruation:
A delayed or missed menstruation is the most common pregnancy symptom leading a woman to test for pregnancy. When you become pregnant, your next period should be missed. Many women can bleed while they are pregnant, but typically the bleeding will be shorter or lighter than a normal period.
Swollen/Tender Breasts:
Swollen or tender breasts is a pregnancy symptom which may begin as early as 1-2 weeks after conception. Women may notice changes in their breasts; they may be tender to the touch, sore, or swollen.
Fatigue/Tiredness:
Feeling fatigued or more tired is a pregnancy symptom which can also start as early as the first week after conception.
Nausea/Morning Sickness:
This well-known pregnancy symptom will often show up between 2-8 weeks after conception. Some women are fortunate to not deal with morning sickness at all, while others will feel nauseous throughout most of their pregnancy.
Backaches:
Lower backaches may be a symptom that occurs early in pregnancy; however, it is common to experience a dull backache throughout an entire pregnancy.
Headaches:
The sudden rise of hormones in your body can cause you to have headaches early in pregnancy.
Frequent Urination:
Around 6-8 weeks after conception, you may find yourself making a few extra trips to the bathroom.
Darkening of Areolas:
If you are pregnant, the skin around your nipples may get darker.
Food Cravings:
While you may not have a strong desire to eat pickles and ice cream, many women will feel cravings for certain foods when they are pregnant. This can last throughout your entire pregnancy.
These are taken from the website:
http://www.americanpregnancy.org/gettingpregnant/earlypregnancysymptoms.html