You are now 12 weeks pregnant (about 70 days since conception) and at the start of week 13. This time marks the end of the 1st trimester (the first 3 months of pregnancy) and the beginning of the 2nd trimester (the second 3 months of pregnancy).
Your baby now measures about 7.6 cm (3.04 inches) from crown to rump and weighs approximately 20 grams (0.7 ounces).
Your baby's bones are changing from being soft and flexible (made mostly of cartilage), to hardening and being mostly bone. He or she is now capable of making creeping and climbing movements, although for most women their baby is still too small to feel. Very fine wisps of hair start appearing on your baby's upper lip and eyebrows.
Your baby's bowels are now able to expand and contract (called peristalsis) filling with a black-green, tar-like substance called meconium. Babies pass meconium as their first bowel motion after birth.
Feeling healthier and stronger
Many women start to feel healthier and stronger within themselves now, compared with the earlier weeks of pregnancy. Perhaps signs of tiredness and morning sickness are starting to subside. However, around 15% of women continue to feel nauseous (or vomit) until 20 weeks of pregnancy, or even beyond this time.
Others may comment on how you are glowing with pregnancy. Many women find their skin, eyes and hair are shining with good health. You may also notice your hair growth is stronger, due to increased levels of oestrogen
Many women seem more balanced with their feelings at this stage often with a sense of calmness and an acceptance of their pregnancy and everything that goes with it. This may follow feelings of ambivalence and the amazing hormonal, physical and emotional adjustments that often accompany the first 12 weeks of pregnancy. It is also common to feel more relaxed, now that the 'magic' 12 weeks has passed and the chances of miscarriage have lessened. However, miscarriage after this time is still possible.
You may begin to notice your appetite returning. Looking after yourself, eating healthy meals and being aware of good nutrition still remains important for both you and your baby.
Women with a vegetarian or vegan diet also need to be mindful of what they eat to make sure they receive all the necessary vitamins and minerals they require.
During pregnancy, your developing baby needs plenty of calcium to grow their own bones. If you do not have enough calcium in your diet, your baby will still obtain the calcium they need, but take calcium stored in your bones, which may lead to inadequate calcium levels for your own health.
A few types of fresh fish can also contain high levels of mercury and should be avoided during pregnancy.
Your pregnancy - Week 12