Missed Period / Light Bleeding
A late or missed period is the most common sign of pregnancy. Light bleeding (spotting) may occur approximately 8 - 10 days from ovulation. It usually happens around the same time you would have gotten your menstrual period. Some women assume they have started their period when in fact they are pregnant. The spotting is caused from implantation which is when the fertilized egg burrows into the endometrial lining.
Swollen or Tender Breasts
Breasts may be very tender, swollen and start to enlarge as early as 1-2 weeks after conception. Many times the veins within the breast will become more visible. Your nipples may start to darken in color, become more erect and be extremely sensitive. These symptoms are due to increasing amount of HCG hormone that begins at implantation.
Pregnancy causes the uterus to swell and it will start to enlarge for the growing fetus immediately. The uterus puts pressure on your bladder making you feel the need for more frequent urination. Many women start to feel this symptom within a week or two after pregnancy has occurred.
Nausea and Morning Sickness
Nausea and morning sickness, or vomiting, may come as early as a week into the pregnancy. Many women experience illness in the morning (morning sickness), some in the afternoon or evening, others feel nausea throughout the entire day, and some don't get it at all.
Feeling more tired is a pregnancy symptom which can begin as early as the first week after conception. When pregnant, your body is going through some major hormonal changes.
Lightheadedness or Fainting
When standing in one place you may feel dizzy or even faint. The growing uterus compresses major arteries in your legs which causes your blood pressure to drop making you extremely light headed. Skipping meals or going too long without eating may cause you to feel dizzy or faint. When not eating frequently enough it causes low blood sugar.
Food Cravings or Aversions
While pregnant, many women will feel cravings for certain foods, or develop a dislike for certain foods.
Lower backaches may be a symptom that occurs early in pregnancy.
The sudden rise of hormones in your body can cause you to have headaches early in pregnancy.