Lady, you are already going strong into your second trimester, yay! The feeling of tiredness, nausea and lethargy will mostly disappear from this week on and your breasts may be feeling less tender. If not, hang in there as it's likely it will pass soon.
You might develop a dark line on your body which runs down the centre of your abdomen. This is called the linea nigra. This line, along with the other hormonal changes will disappear a few weeks post birth.