Your little one's body is beginning to catch up with size of their head, which finally only accounts for one-third of their total size instead of half. Their teeth are in place under their gums, waiting to come out during teething, which starts as early as three months or as late as twelve months after birth. (Fun Fact: Some babies have one or two teeth showing when they are born!)

Your baby's skin is still paper thin and transparent, which means that for now, the veins and organs are still visible. Their intestines are forming villi, which aid in peristaltic movement and digestion. Your baby's pancreas is secreting insulin, unique finger prints are forming, and vocal cords are beginning to develop. If you are having a girl, she will have more than two million eggs already in her ovaries at week 13.

You've made it to your second trimester! Are you feeling any better? If not, you should be soon. The second trimester is known for being more comfortable and easier than any other trimester. It's the "honeymoon period" of pregnancy for many expecting moms, who say they have more energy, and less nausea and fatigue.

Are you feeling some pain along the side of your abdomen? This round ligament pain is due to your expanding uterus. It may feel like mild discomfort and cramping, and it may feel like a short stabbing pain. Consider it a little reminder from your body, telling you to slow down. It usually occurs when you shift positions quickly and it subsides within a few minutes. If any pain you experience concerns you, or is accompanied by bleeding, vomiting, or cramping, contact your physician immediately.

Even though your belly is continuing to grow, you may not need maternity clothing yet. This is normal. It's also normal to discover visible, small bumps on your breasts. These small bumps were always there, they just become more noticeable during pregnancy. They're an oil-producing gland, called Montgomery tubercles, helping your body prepare for nursing.

Did you know there's a chance you could feel your baby this week? Everyone feels those special flutters in their own time, but some women feel them as early as 13 to 16 weeks!

Chances are by week 13 your libido may be lifting a little. So with the first trimester behind you, it's time to celebrate! Find a unique way to do something special for yourself. Thanks to hormonal changes and a decrease in symptoms, like fatigue and morning sickness, you've probably got that lovin' feelin' back. Maybe some new lingerie for your increasing cup size is just what the doctor (or midwife) ordered!