At 7 weeks pregnant, your uterus is roughly the size of a large egg, measuring about 7 to 8 centimeters long. That’s only slightly larger than its non-pregnant size (about 6 centimeters), so you won’t see or feel much difference from the outside yet. The growth is real, though, and it’s already reshaping things inside your pelvis.
How Big the Uterus Actually Is
Before pregnancy, the uterus is often compared to a plum, roughly 6 centimeters long and weighing about 60 grams. By 6 weeks, it’s typically described as egg-sized. By 8 weeks, it reaches the size of a small orange. At 7 weeks, you’re right in between: bigger than a plum, not quite an orange, and close to the size of a large chicken egg or a lemon.
At this stage, the uterus still sits entirely within your pelvis, nestled between your bladder and rectum. It won’t rise above the pelvic bone (where a doctor could feel it through your abdomen) until around 12 weeks. So even though it’s growing, your belly likely looks the same as it did before pregnancy. Any early bloating you notice is from hormonal changes affecting your digestion, not the uterus itself pushing outward.
What’s Inside at 7 Weeks
The embryo at 7 weeks measures roughly 10 to 15 millimeters from crown to rump, depending on exactly which day of the week you’re in. That’s about the size of a blueberry. But the embryo isn’t the only thing taking up space. The amniotic sac, the developing placenta, and an increasing volume of amniotic fluid all contribute to the uterus needing to expand. The uterine walls are also thickening with an extra blood supply, which accounts for much of the early size increase.
Why You Might Feel It Growing
Even though the size change is modest, some people feel mild cramping or pulling sensations in the lower pelvis around this time. This is often caused by the round ligaments, two cord-like structures that support the uterus on either side. As the uterus expands, these ligaments stretch and widen. The sensation can feel like period cramps, a dull ache, or a brief sharp pull on one or both sides of the lower abdomen. It typically lasts only seconds to minutes and is more noticeable with sudden movements like standing up quickly or rolling over in bed.
Round ligament pain is most common during the second trimester, when growth accelerates, but it can show up as early as the first trimester. Light pressure, changing positions slowly, and gentle stretching tend to ease it.
Twins and Other Variations
If you’re carrying twins or multiples, the uterus starts growing and stretching sooner than in a singleton pregnancy. By 7 weeks, the difference may not be dramatic on an ultrasound, but your body is already producing higher levels of the hormones that drive uterine growth, and you may notice more bloating or cramping earlier than expected.
The natural position of your uterus also plays a role in what you feel. Most uteruses tilt forward toward the bladder (anteverted), but about 20 to 25 percent tilt backward toward the rectum (retroverted). A retroverted uterus can sometimes cause more back discomfort in early pregnancy and may make it slightly harder for an ultrasound technician to get clear images at this stage. Neither position affects the pregnancy itself.
When You’ll Start Showing
The jump from plum to orange doesn’t sound like much, and it isn’t, visually. Most first-time pregnancies don’t produce a visible bump until 12 to 16 weeks, when the uterus rises out of the pelvis and begins pushing the abdominal wall forward. People who have been pregnant before may show a bit earlier because the abdominal muscles have already stretched once.
Between now and 12 weeks, the uterus will roughly double in size, growing from that egg-sized shape to something closer to a grapefruit. After that, growth speeds up considerably. By 20 weeks it reaches your navel, and by 36 weeks it sits just below your ribcage. The 7-week stage is the very beginning of a process that will eventually increase the uterus to about 500 times its original capacity.