What happens in the second trimester

The second trimester runs from week 13 through week 26 or 27, depending on how a provider defines the cutoff. This is often the stretch where energy comes back, nausea fades for many people, and the pregnancy starts to feel more real physically, with a visible bump and, eventually, movement you can feel.

A rough week-by-week shape

Weeks 13 to 16 are typically when early symptoms ease and appetite returns. Weeks 16 to 20 usually bring the first felt movements, called quickening. Around 18 to 22 weeks is the anatomy scan, a detailed ultrasound checking the baby's organs and growth. By weeks 24 to 27, viability outside the womb becomes medically possible with intensive care, though the goal is always to stay pregnant as long as it is safe to do so. For the full breakdown, see Everything to Expect in the Second Trimester of Pregnancy.

Common symptoms

Round ligament pain (sharp, brief pulls in the lower belly or groin as the uterus grows), mild swelling in the feet and ankles, nasal congestion, and a return of appetite are all typical. Mood swings do not disappear just because nausea does. Hormonal shifts continue throughout pregnancy, and it is common to have emotional ups and downs well into the second trimester; see Pregnancy Mood Swings for what is typical versus what warrants a conversation with your provider. For the fuller symptom list specific to this stage, see Second Trimester Symptoms.

Appointments and tests

Appointments typically move to about once a month during this stretch. Key tests include the anatomy ultrasound around 18 to 22 weeks and the glucose screening test for gestational diabetes, usually done between 24 and 28 weeks. ACOG recommends this screening for most pregnant people, since gestational diabetes often has no noticeable symptoms but can affect both parent and baby if left unmanaged. Your provider will also keep checking blood pressure and urine at every visit to watch for early signs of preeclampsia.

Practical checklist for this trimester

  • Book the anatomy scan around 18 to 20 weeks if it has not been scheduled
  • Ask your provider about the timing of your glucose screening
  • Start sleeping on your side if back-sleeping has become uncomfortable
  • Consider a childbirth education class, since many fill up early
  • Begin researching pediatricians if you have not chosen one
  • Track fetal movement patterns once you start feeling them regularly

When to call your provider

Contact your provider for a sudden increase in swelling (especially in the face or hands), severe or persistent headaches, vision changes, a noticeable drop in fetal movement after you have started feeling it regularly, vaginal bleeding, or contractions before 37 weeks. These can be early signs of preeclampsia or preterm labor, both of which are far more manageable when caught early.

How these guides fit together

Read the week-by-week overview for the general arc of this trimester, then use the symptoms guide as a quick reference when something new shows up and you want to know if it is typical. If mood swings are catching you off guard, the mood swings guide walks through what is hormonal and what might need extra support.

Frequently asked questions

Why do people call the second trimester the easier one?

For many people, first-trimester nausea and fatigue ease up once hormone levels stabilize, and the bump is not yet large enough to cause the discomfort common in the third trimester. It is not universal, but it is common enough to be the general reputation.

When will I feel the baby move?

Most people feel first movements, often called quickening, somewhere between 16 and 25 weeks. First-time parents tend to notice it later than people who have been pregnant before, since they are less familiar with the sensation.

What is the anatomy scan and when does it happen?

It is a detailed ultrasound, usually done between 18 and 22 weeks, that checks the baby's organs, growth, and anatomy in detail. It is also typically when parents can find out the baby's sex, if they want to know.

For more on recommended prenatal testing by trimester, see ACOG's prenatal care guidance.