Months 1 – 12
Month 3 is the home stretch of the first trimester, and for a lot of women it's when the worst of the nausea starts to loosen its grip. Not everyone gets that relief this early, and that's normal too. By the end of this month you'll be closing in on your first trimester screening and, for many people, the first ultrasound where the baby actually looks like a baby.
Physical changes you might notice
Everything from Month 2 can still be in play, plus a few new additions. Constipation is common as digestion slows further. Food cravings often show up alongside the aversions you may already have. Occasional mild headaches, faintness, or dizziness can happen too, usually from normal blood pressure and blood sugar shifts. Skin changes are common as well, some women get clearer skin, others deal with acne or rashes they didn't have before.
Emotional changes you might notice
On top of what showed up in Month 2, it's common to start worrying more actively about miscarriage, especially before that first ultrasound. Anticipation builds too, alongside very real anxiety about how your body's changing, what kind of parent you'll be, and how finances will stretch to cover a new person. All of that can sit right next to genuine excitement, sometimes in the same afternoon.
Appetite changes
Morning sickness and cravings from last month may intensify before they ease up, which can feel discouraging if you were hoping for relief already. Hang in there. For most women, the nausea does start to fade as the second trimester gets closer.
The inside story
By the end of this month, what's been called an embryo officially becomes a fetus. It's grown to about 2.5 inches from head to bottom and weighs around half an ounce, roughly the size of a plum. The heart has finished its basic structure, arms and legs are fully formed with fingers and toes, and fingernails are starting to grow. The face is looking more distinctly human, and early bone is beginning to replace the softer cartilage that shaped the skeleton up to now.
Sleep and energy
The fatigue advice from Month 2 still applies. Sleep position isn't something to stress over yet either, back sleeping is perfectly fine at this stage, and it only becomes worth switching away from later in pregnancy, generally past the halfway point, once your uterus is large enough to press on major blood vessels when you lie flat. For now, sleep however is comfortable.
Easing the stress
The techniques from Month 2 are still worth leaning on. Sex is generally safe to continue throughout a healthy pregnancy, and most couples don't need to change much of anything. If your doctor does recommend limiting it for a specific medical reason, ask what alternatives make sense for you rather than assuming intimacy is off the table entirely.
Special risks worth knowing about
The miscarriage and ectopic pregnancy risks covered in Month 2 carry into this month too, though risk drops meaningfully once a healthy heartbeat has been confirmed on ultrasound. This is also a good time to think about genetic screening if you're 35 or older, have a family history of genetic conditions, or just want more information. A genetic counselor can walk you through what your options actually mean rather than leaving you to guess from a pamphlet.
Call your doctor if you get a fever above 100.4 degrees without cold or flu symptoms, a severe headache, blurred, dim, or double vision, fainting or ongoing dizziness, sudden and unexplained weight gain, a sudden increase in thirst paired with painful or sparse urination, or any bleeding or cramping.
Ready to see what's actually happening in there? Our ultrasound images page shows what these early scans look like, and our second trimester testing guide covers what's coming up next. The March of Dimes has a clear overview of genetic screening options if you want to read more before that conversation with your doctor. From here, Month 4 kicks off the second trimester.