11 weeks pregnant: what’s happening this week
Eleven weeks pregnant is two weeks from the way many guides mark the second trimester. Some people feel a first hint of energy; others feel hotter and more tired while the placenta takes over. The baby is about 4.1–5 cm — often a fig — and may already be moving in a space you cannot feel.
Baby this week
Length at 11 weeks pregnant is a range. NHS publishes about 41 mm (4.1 cm) and uses a fig. Mayo Clinic publishes about 50 mm (5 cm) and about 8 g (roughly 1/3 ounce) by this week. March of Dimes does not give a millimetre length; they note that the head is about half of the baby’s size and that skin is still thin. Working range: about 4.1–5 cm crown to rump. Fig is NHS-only among the official set; we keep it as their picture.
Mayo Clinic uses the word fetus from week 11. NHS started using it around week 8. Your notes may use either word.
The head is still “supersized,” in NHS language, but the body is catching up. Fingers and toes are separating. There are tiny fingernails and miniature ears. Mayo Clinic describes a broad face, widely spaced eyes, fused eyelids, ears set low, tooth buds, and red blood cells beginning to form in the liver. Outer genitals are starting to develop. You still will not get a reliable sex from most scans.
Bones are beginning to harden and the skin is still thin. The baby is moving. You probably will not feel it for several more weeks.
The placenta is about to do more of the feeding and waste work that the yolk sac started. Hormone shifts during that hand-over can make you feel wiped out. That is a body story, not a character story.
Your body this week
You may notice a small bulge. Stretching ligaments can give you aches around the lower belly. Mild twinges are common. Pain that is severe, one-sided, or stops you doing ordinary things is a same-day call — not because every ache is an emergency, but because you should not have to grade your own pain at home.
Blood volume can already be well on the way toward that “up to 50% more” pregnancy rise. Extra blood feeds the womb. It can also make you feel hot, sweaty, or dizzy. Sit down. Drink. Then mention it if it keeps happening.
NHS says you will be offered a range of checks around now — blood, urine, blood pressure — as part of routine antenatal care. Hospitals in England usually offer two ultrasounds in an uncomplicated pregnancy. The first is a dating scan between about 8 and 14 weeks. Week 11 sits comfortably in that window.
A sonographer uses sound waves to build a picture. The visit can include a nuchal translucency (NT) measurement — fluid at the back of the baby’s neck — as part of screening that some people choose. Screening is offered, not required. You can ask what a result would mean before you decide.
Nausea, sore breasts, heartburn, headaches, and bloating may still be here. Gentle walking helps some people feel less leaden.
This week’s checklist
- Write scan questions if you have a dating visit this week: dates, heartbeat, what you will see, whether NT is included, and whether you want to know anything else.
- Pack a practical scan bag: water if you were asked to have a full bladder, your notes, a snack for after.
- Rest when you feel hot or dizzy. That is a task, not a fail.
- Keep folic acid going through week 12.
- Tell a coparent the scan time and how you want the room to feel — quiet, questions, or just a hand.
When to talk to your provider
Call if belly pain is strong, one-sided, or different from the stretching twinges you have already had. Call for bleeding, faintness, or shoulder pain. Call if dizziness does not pass, you cannot keep fluids down, or you have a severe headache.
If you have a scan and you do not understand a sentence on the report, ask the unit or your midwife to translate it. You are not expected to speak ultrasound.
If mood dips as the placenta switchover makes you tired, say that at your next contact. Tired and low are allowed to be two separate problems.
How BabyPath helps this week
Scan week is full of logistics. The free daily checklist (3 items) can hold “pack water,” “write questions,” and “take the vitamin.” Daily tips are 2/day free, 5/day Plus. Ask AI in the app (3/day free, 20/day Plus) can help you turn a scan leaflet into a short question list — then you ask the sonographer, not the app, for the medical answer. Letter to Baby for week 11 is free; Plus keeps the archive, which is useful once letters start stacking up. Get the app. Full guidance lives in the app; this page is for reading and sharing.
FAQ
What is a dating scan at 11 weeks?
It is an ultrasound that checks how many babies there are, where the pregnancy is, and how the length of the baby matches your dates. ACOG notes that a first-trimester crown–rump measurement is the most accurate common way to confirm gestational age. The visit may also offer screening measurements. You can accept or decline screening and still have dates checked.
Can you feel the baby move at 11 weeks?
Almost never in a way you can trust. The baby may kick; the uterus is still small and the movements are light. Most people feel movement later in the second trimester. Gas and stretching can impersonate flutters this early.
Why am I so hot and dizzy at 11 weeks?
Extra blood, extra heat, and a placenta that is taking on more work are a lot. Sit, sip, and eat something small. If dizziness is sudden, you faint, or you have pain or bleeding with it, get urgent advice.
Keep reading
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Disclaimer
BabyPath is not a medical device. This page is general information, not personal medical advice, diagnosis, or treatment. Talk with a midwife, GP, or obstetric clinician about your own pregnancy.