Symptoms of 2 weeks of pregnancy: i. Fatigue. You may feel unusually tired during the first 2 weeks of pregnancy, which may be caused by elevated levels of progesterone in the body as it continues the lining of the uterus to complete conception. Second, nausea. Nausea and even vomiting may be felt during the 2nd week of pregnancy and usually lasts until 12 weeks, although this is often referred to as morning sickness, it can occur at any time of the day or night, or even throughout the day. Third, breast changes. At 2 weeks of pregnancy your breasts may become a little larger, sore or highly sensitive to the touch, the veins on your breasts may be more visible, and the areolas may become very dark. IV. No menstruation. If the menstrual cycle is regular, often the earliest physical sign of pregnancy is the absence of a period.