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🌱First Trimester• Week 5 of 40

Week 5 of Pregnancy

Your baby is about the size of a sesame seed

5
Weeks Pregnant
245
Days to Go
1
1st Trimester
Pregnancy Progress13%
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Your Baby This Week

Development milestones for week 5

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Baby Size
Sesame seed

At 5 weeks pregnant, your baby is about the size of an orange seed or apple seed - roughly 2-3 millimeters. This week marks the beginning of the embryonic period, where all major organs and systems begin their development. Your baby's heart, which started as a tube, is beginning to beat - although it is too early to detect on most ultrasounds. The neural tube is closing, which is why folic acid intake has been so crucial. Tiny buds that will become arms and legs are starting to emerge. The digestive system and lungs are beginning their earliest formation. The placenta is developing rapidly, establishing the connection that will nourish your baby throughout pregnancy. Despite being almost invisible to the naked eye, your embryo is undergoing the most critical period of development - this is when the foundation of every organ system is laid.

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Your Body This Week

Changes you may experience

Welcome to the hormone surge that defines early pregnancy. At 5 weeks pregnant, hCG levels are climbing steeply, and many women start feeling it. Fatigue often hits hard - this is not ordinary tiredness, but a bone-deep exhaustion that makes you want to sleep at 7 PM. Many describe it as "falling asleep mid-sentence" or "needing naps like a toddler." Nausea may begin creeping in, though it is typically mild at this point compared to what is coming. Your breasts might feel fuller and more tender, with nipples that hurt when anything touches them. Some women report a metallic taste in their mouth or heightened sense of smell - suddenly your partner's cologne is unbearable. Bloating is common, and your jeans might feel tight even though your uterus is still the size of a pear. Mood swings can be intense as hormones fluctuate.

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Tips & Advice for Week 5

Practical guidance from real moms

Listen to your body - if you are exhausted, rest. First trimester fatigue is not laziness; your body is building an entire human and that requires enormous energy. Eat small, frequent meals to combat early nausea; keeping crackers by the bed for morning queasiness is a tried and true method. Stay hydrated, but if plain water triggers nausea, try adding lemon or switching to sparkling water. Start taking photos of your belly now, even though there is nothing to see - you will appreciate the comparison later. Talk to your partner about how you are feeling; early pregnancy can be isolating when you cannot share the news publicly. If you have not already, cut out alcohol completely. Reduce caffeine to under 200mg daily (about one 12-oz coffee). Continue your prenatal vitamins, ideally taking them with food to reduce stomach upset.

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Medical Guidance for Week 5

What to discuss with your healthcare provider

Most practices schedule the first prenatal visit around 8 weeks, so you may not see your provider yet. If you have a history of miscarriage, ectopic pregnancy, or fertility treatments, your doctor may order early beta hCG monitoring or a viability ultrasound. Watch for severe pain, especially on one side, or heavy bleeding - these require immediate evaluation. Otherwise, patience is the name of the game.

Disclaimer: For educational purposes only. Consult your healthcare provider for personalized medical advice.