Week 12

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Mother:

You may actually start feeling better from your extreme tiredness and nausea this week. Others will hang on to it for awhile longer. Your abdomen may start expanding, especially if this is not your first pregnancy.
Your placenta will take over the production of hormones around this time. If you have suffered from corpus luteum cysts they may begin to dissolve now. Your risk of miscarriage is reduced even further.

Baby:

While your baby's brain is not the same size it will be at birth, it does have the same structure. Bile is being secreted by this time. S/he weighs about 14 grams and is approximately 3.54 inches in total length.
Your baby has its reflexes and also practice movements in the digestive tract. All of this in preparation for extrauterine life.
If your practitioner uses a doppler, you may be able to hear your baby's heart beat at this office visit. It will sound very fast. Some say that they hear clicking or the sounds of horse hooves. Either way it is a joyous sound to hear! Your risk of miscarriage is greatly reduced once you hear this sound.
Me:
I don't feel very pregnant. Still more morning sickness, and a new pain in my sternum.
Weight:
120