Pregnancy : 13 Week

Mother:

If you are experiencing some abdominal achiness it may be due to the stretching of the round ligaments that support your uterus.
Are pickles and ice cream sounding appealing? Even if that combo still sounds disgusting, many women do experience food cravings. As long as they are not harmful go ahead and give in to them in a moderate way.

Some women do crave harmful things like kerosene, clay, starch, ice or nail polish. This is a disorder known as pica and should be discussed with your caregiver. This article has some good information about pica, its causes and treatment:
Since you are really beginning to show, the subject of stretch marks will come up. You may or may not get them. This has far more to do with your genetic heritage than whether or not you use an expensive anti-stretch mark cream.
The veins on your breasts are probably much more noticeable and your nipples darker in color.

Baby:

Our baby is entering the 2nd trimester and is fully formed, and boy, is this baby active! As you can see from the video, the baby is constantly moving and exercising those muscles! The baby's neck is getting longer so the head is not constantly touching his/her chest.Baby Coffman now has working reflex movements. You could see this a few weeks ago on the video when Lisa pat her belly and the baby squirmed. Hands and feet are responsive and the hands open and close.The baby's little fingerprints are now fully formed and unique.All nourishment is being supplied by the placenta now.At week 13, the baby gains the ability to smile. That's great, because this baby has made us smile from the day we found out about him/her.

Your baby's vocal cords have begun to develop.
More and more of the organs are functioning every day. The liver has begun to secrete bile and the pancreas to produce insulin.
All twenty baby teeth are formed and waiting beneath his gums until well after birth. However, every once in a while a baby is born with teeth already showing.
The baby's bone marrow, liver and spleen have taken over the production of red blood cells.
Although the baby's intestines were originally formed inside the umbilical cord, they are now moving into the abdomen.

Fuzzy hair is beginning to form on your little one's head. Regardless of what color that hair will eventually be, it is white (unpigmented) right now.