Pregnancy Symptoms Week by Week

This article is for informational purposes only and is not medical advice. Always consult your healthcare provider with questions about your pregnancy.

TL;DR

Weeks 4-6: Missed period, fatigue, sore breasts, maybe nausea starting
Weeks 7-12: Peak nausea, extreme fatigue, frequent urination, mood swings
Weeks 13-20: Nausea fades, energy returns, round ligament pain, baby bump appears
Weeks 21-40: Movement, heartburn, back pain, Braxton Hicks, swelling, insomnia — and then labor

Every pregnancy is different. You might experience all of these, none of these, or a completely different combination. All of that is normal.

First Trimester (Weeks 1-13)

Weeks 1-3: Before You Know

You probably won't notice anything yet. Conception happens around week 2, and implantation around week 3-4. Some people report light spotting (implantation bleeding) or mild cramping.

Weeks 4-5: The First Signs

Missed period — The most common first clue
Fatigue — An overwhelming, can't-keep-your-eyes-open tiredness
Breast tenderness — Sore, heavy, or swollen
Mild cramping — Similar to period cramps
Bloating — Hormones slow digestion
Mood changes — You might feel more emotional than usual

Weeks 6-8: Nausea Arrives

Morning sickness — Despite the name, it can happen all day. Peaks around weeks 8-10.
Food aversions — Things you loved now make you gag
Heightened sense of smell — Everything smells stronger (and worse)
Frequent urination — Your uterus is pressing on your bladder
Increased fatigue — Still intense

Weeks 9-11: Peak First Trimester

Nausea may peak — This is often the worst stretch, but it means hormones are doing their job
Acne — Hormones can trigger breakouts
Constipation — Progesterone slows your digestive system
Visible veins — Increased blood volume makes veins more prominent

Weeks 12-13: Turning the Corner

Nausea starts to fade for many people
Energy may begin returning
Your waistband gets tight — Not quite a bump yet, but things don't fit the same
Reduced urination frequency — Temporarily, as the uterus rises out of the pelvis

Second Trimester (Weeks 14-27)

Weeks 14-16: The Relief

Energy rebounds — Many people feel the best they will all pregnancy
Appetite returns — After weeks of nausea, food sounds good again
Less breast tenderness — Still larger, but less sore
Nasal congestion — Pregnancy rhinitis from increased blood flow
Occasional headaches

Weeks 17-20: Movement and Growth

Quickening — You might feel baby move for the first time. First-time parents often feel it around weeks 18-22. It feels like flutters, bubbles, or popcorn.
Round ligament pain — Sharp pains in your lower belly as things stretch
Visible baby bump — Other people might start noticing
Skin changes — Linea nigra, darkening nipples, possible melasma
Increased appetite — You're growing a baby and a placenta

Weeks 21-24: The Middle

Stronger fetal movement — Kicks you can actually see from outside
Braxton Hicks contractions — Mild, irregular tightening of the uterus
Leg cramps — Especially at night
Swelling — Mild swelling in feet and ankles begins
Back pain — Your center of gravity shifts forward
Heartburn — May start as the uterus pushes the stomach upward

Weeks 25-27: Heading Into the Third Trimester

Difficulty sleeping — Finding a comfortable position gets harder
Shortness of breath — Baby is crowding your diaphragm
Hemorrhoids — Increased blood volume and pressure. Common and manageable.
Itchy skin — Your belly skin is stretching
Carpal tunnel symptoms — Fluid retention can compress wrist nerves

Third Trimester (Weeks 28-40)

Weeks 28-31: The Home Stretch Begins

Braxton Hicks increase — More frequent practice contractions
Heartburn intensifies — Smaller meals help
Fatigue returns — Not like the first trimester, but carrying 20+ extra pounds is tiring
Vivid dreams — Common and often strange
Leaky breasts — Colostrum (early milk) may start leaking

Weeks 32-35: Getting Bigger

Pelvic pressure — Baby is getting heavy
Shortness of breath — Your lungs are running out of room
Frequent urination returns — Baby is sitting on your bladder again
Difficulty sleeping — Between bathroom trips, heartburn, and discomfort
Lightning crotch — Sharp, shooting pain in the pelvis from nerve pressure. It's as fun as it sounds.
Clumsiness — Your center of gravity is different and your joints are looser

Weeks 36-38: Almost There

Baby drops (lightening) — Breathing gets easier, but pelvic pressure increases
Nesting instinct — Sudden energy to clean and organize everything
Increased vaginal discharge — Normal as your body prepares for labor
Losing mucus plug — Can happen days or weeks before labor
More intense Braxton Hicks — Practicing for the real thing

Weeks 39-40: Due Date Zone

Everything from above, intensified
Loose stools — Your body may clear things out before labor
Lower back pain — Persistent, dull ache
Restlessness and impatience — Totally justified
Possible signs of early labor — See our signs of labor guide

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Symptoms That Need Attention

Most symptoms are normal discomforts, but contact your provider if you experience:

Heavy vaginal bleeding
Severe abdominal pain
Sudden severe headache
Vision changes (blurring, spots)
Sudden swelling in face or hands
Fever over 100.4F
Decrease in baby's movement
Fluid gushing or leaking from vagina
Contractions before 37 weeks that are regular and increasing

The Bottom Line

Pregnancy symptoms are as varied as the people experiencing them. This guide gives you a general roadmap, but your journey will be uniquely yours. When in doubt about whether something is normal, call your provider — that's what they're there for.