The First Trimester:
When Your Body and Life
Begin to Shift
Right now, something smaller than a sesame seed has taken up residence inside you. And your body knows — it’s already doing all sorts of things you never asked for.
The first trimester is when your body undergoes its most dramatic transformation. The hormone hCG surges rapidly, progesterone and estrogen climb, and your entire system is working overtime to build the placenta — the structure that will keep your baby alive for the next nine months.
The tricky part? None of this is visible from the outside. But it is very, very felt from the inside.
What to expect
Common Symptoms in the First Trimester
Nausea & Morning Sickness
The name is misleading — it doesn’t only happen in the morning. Some women feel sick all day, some only in waves, some not at all. Every variation is normal. Usually begins around week 6 and eases around weeks 12–14.
⚠️ If you’re vomiting so much you can’t keep water down, lost more than 2kg, or your urine is very dark — you may have Hyperemesis Gravidarum, which requires medical attention.
Unusual Fatigue
First-trimester exhaustion isn’t like ordinary tiredness. It’s a deep, bone-level heaviness — your body is running on full overtime. The placenta is forming, your baby’s heart is beginning to beat, and the nervous system is developing at a breathtaking pace. Rest when you can. Don’t feel guilty about it.
Fetal development
Your Baby in Weeks 1–12
The embryo is smaller than a sesame seed. The heart begins to beat.
Eyes and ears start forming. Tiny limb buds appear.
Fingers and toes begin separating. The brain develops rapidly.
The embryo officially becomes a fetus. All major organs are present.
The size of a lime. Fingerprints have already formed. Movement begins — though you won’t feel it yet.
Medical care
Important Checkups
Safety
What to Avoid Strictly
Any medication not approved by your doctor — including herbal supplements and vitamins you haven’t discussed
Raw or undercooked foods: sushi, rare steak, raw eggs, deli meats that haven’t been heated
High-mercury fish: shark, swordfish, king mackerel, bluefin tuna
Excessive heat: hot tubs and saunas can raise core body temperature to dangerous levels
Alcohol and cigarettes — there is no safe amount during this stage
A personal decision
To Tell, or Not to Tell?
There’s no right answer.
Many people wait until after 12 weeks to share the news, because the risk of miscarriage is highest in the first trimester — around 10–20% of known pregnancies. Many prefer not to have to un-share difficult news.
But there’s no rule. Tell people when you feel ready. And consider telling those you’d want for support if something were to go wrong.
“The first trimester may be invisible to the rest of the world. But it holds the most important construction project of your baby’s entire life.”
You may feel terrible physically. But the body doing all of that feeling is doing something extraordinary.