At seven weeks pregnant, the embryo is about 10 to 15 millimeters long, roughly the size of a blueberry. Your body, meanwhile, probably looks the same to everyone else. The real changes at this stage are mostly internal, happening fast but hidden from view.
What the Embryo Looks Like at 7 Weeks
The embryo at this point has a distinctly oversized head compared to the rest of its body. That’s because the brain is developing rapidly, building on the neural tube that formed just a couple of weeks earlier. Bones are beginning to replace soft cartilage, and the earliest stages of genital formation are underway.
Tiny arm and leg buds appeared around week six and are continuing to grow, though they still look more like small paddles than limbs. The heart, which started as a cluster of pulsing cells, is now beating at roughly 110 times per minute or faster. It’s been detectable on a transvaginal ultrasound since around week six.
What You’d See on an Ultrasound
If you have an ultrasound at seven weeks, you’ll see three structures: the gestational sac (a dark, fluid-filled circle), the yolk sac (a smaller bright ring that provides nutrients to the embryo), and the fetal pole, which is the embryo itself. At this stage, the fetal pole looks like a small white smudge or grain of rice nestled inside the sac. It doesn’t look like a baby yet.
A heartbeat is typically visible once the fetal pole reaches 5 to 7 millimeters, which usually happens around week six. By week seven, a heartbeat should be clearly detectable. If the fetal pole measures more than 7 millimeters with no heartbeat, that’s considered a sign of an abnormal pregnancy.
What Your Body Looks Like
Most people don’t have a visible baby bump at seven weeks, especially with a first pregnancy. The bump typically becomes noticeable between weeks 12 and 16. What you might notice now is bloating. Rising hormone levels cause your body to retain fluid, which can make your lower abdomen feel puffy or tight. This is hormonal bloating, not the uterus pushing outward yet.
Your uterus has grown to about the size of a medium orange, up from its usual size of a small pear. It’s still tucked behind your pelvic bone, so it’s not contributing to any visible change in your silhouette. The position of your uterus matters too: if it tilts toward the front of your body, you may show a little earlier in the coming weeks, while a uterus that tilts toward the back can delay a visible bump.
Skin and Hair Changes
Some people notice their skin breaking out around this time. The cause is a surge in oil production driven by pregnancy hormones. This isn’t a special type of acne, it’s the same kind triggered by excess oil, just brought on by a different hormonal situation. Not everyone gets it, though.
You might also notice darkened patches on your face, sometimes called the “mask of pregnancy.” These brown or tan areas appear on the forehead, cheeks, or upper lip and are caused by increased melanin production. Your hair may look thicker and shinier than usual, a side effect of hormonal changes that slow the normal rate of hair shedding.
How 7 Weeks Typically Feels
Seven weeks is often when first-trimester symptoms hit their stride. Nausea and morning sickness (which can strike at any time of day) are common, along with deep fatigue that sleep doesn’t fully fix. Your breasts may feel sore and heavier than usual.
Some less expected symptoms are also normal at this stage:
- Metallic taste in your mouth that lingers regardless of what you eat
- Heightened sense of smell that can trigger or worsen nausea
- Sudden food aversions or cravings for things you wouldn’t normally choose
- Mild cramping similar to period pains, caused by the uterus stretching
- Light spotting, which can happen but is worth mentioning to your doctor
- White milky vaginal discharge, which is a normal response to increased hormone levels
- Mood swings and headaches driven by the same hormonal shifts behind everything else
The combination of nausea, exhaustion, and mood changes can make week seven feel harder than the weeks before it, even though nothing has visibly changed on the outside. That disconnect between how you feel and how you look is one of the defining features of early pregnancy.