First Trimester 1 to 12 Weeks

Trimester 1


Body changes during pregnancy are quite common and normal. The first trimester starts on the first day of your last period and lasts until the 12th week. A lot of physiological and hormonal changes take place during this phase as the baby grows the fastest in this trimester. Starting from a fertilized egg, the baby’s bones, muscles, and organs form by the 12th week. The first trimester requires a variety of lab investigations and tests, which our skilled team of doctors at Motherhood is well versed with.


Changes in the body during Trimester 1:

Here are a few changes in the body that you can expect in the first trimester:

  • Tenderness in the breast is one of the earliest signs of pregnancy which happens due to hormonal changes. It can last through the first trimester.
  • About one in four women report bleeding during the first trimester. Mild bleeding may be a sign of embryo implanting itself in the uterus, but medical attention is required in case of severe bleeding.
  • Constipation and bloating are quite common in the early stages of pregnancy.
  • Thin and milky white vaginal discharge is also common in the first trimester.
  • Fatigue, food aversions or cravings, mood swings, heartburns, and nausea are very common during early pregnancy.


Fetal growth during 1st trimester:

Here is how the fetus develops and your body reacts through the first trimester:

Week 1-2: You may not notice anything and if the egg meets the sperm, you are on your way to pregnancy.

Week 3: The egg is fertilized and immediately forms a barrier to prevent other sperm from entering. It quickly undergoes multiple cell divisions and forms a blastocyst. It gradually travels from the fallopian tube to the uterus and plants itself. You may begin to notice slight breast tenderness during this time.

Week 4: The baby is an embryo now with two layers. Around this time, the placenta starts developing too. You may feel bloating and start experiencing mood swings by this time.

Week 5: By this time, you can use a home pregnancy test to confirm your pregnancy and call your obstetrician for your first prenatal visit. The embryo grows quickly, and major organs and systems have already started to develop. You may already have missed your periods by now, and you may feel extremely fatigued and exhausted during this time.

Week 6: The baby’s nose, mouth, ears begin to take shape. The baby is about a quarter of an inch big and you may be having morning sickness and spotting by now.

Week 7: Your obstetrician might schedule a scan this week and give you the approximate date of delivery. The baby is already twice the size of the previous week and complex organs like the brain and heart are developing at a fast pace. You may be going through mood swings, tender breasts, and even pimples on your skin.

Week 8: The baby is growing at an astonishing rate. It has already started to move (though you can’t feel it yet) and is beginning to resemble a human. Your uterus is expanding, and you may notice an increase in the frequency of urination. Besides, you may also face cramps in the abdomen and dark spots on the face (melasma).

Week 9: The baby is officially a fetus and new organs like liver and spleen are starting to form. The mood swings, nausea, increasing waistline continue during this week too.

Week 10: The baby is now able to swallow, and minute details like nail beds, hair follicles start to form. Your uterus has expanded to cover your pelvis and you may notice blue lines running across your abdomen and breasts.

Week 11: At this point, the baby has fully developed hands and legs with individual fingers. The baby can stretch and roll forward now (though you may still not feel it). The first trimester is about to end and symptoms like nausea may gradually begin to fade away at this point.

Week 12: Most of the baby’s organs are now formed and the baby is still growing at a very fast pace. Morning sickness, nausea, bloating etc continue to decrease as you approach the end of your first trimester. However, in some cases, these symptoms can continue until the end of pregnancy.


Why Motherhood?

Trimester 1 requires various lab tests, professional consultations, and help. We at Motherhood, provide special antenatal services which include:

  • Early pregnancy scan
  • NT Scan
  • Thyroid profile
  • Serum Creatinine
  • Gynaec consultation
  • Physiotherapist consultation
  • Dietician consultation
  • Urine checkup
  • HIV check

Motherhood’s antenatal care facilities provide comprehensive consultations, lab investigations, and radiology services to provide the best possible care to the mother as well as the child.