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www.parents.com/pregnancy/week-by-week/your-first-trimester-of-pregnancy-week...

Every week of your first trimester is full of excitement -- whether you know you're pregnant or not! From when to expect common pregnancy symptoms to what size your baby will be each week, here's ...

www.webmd.com/baby/guide/first-trimester-of-pregnancy

WebMD explains the first trimester of pregnancy. You'll find out what to expect during the first trimester, along with signs and symptoms to know you're pregnant.

americanpregnancy.org/while-pregnant/first-trimester

The First Trimester of Pregnancy Week 1 & 2 – Gestational Age. Your menstrual period has just ended, and your body is getting ready for ovulation.For most women, ovulation takes place about 11 – 21 days from the first day of the last period.During intercourse, several hundred million sperm are released in the vagina.

flo.health/pregnancy/week-by-week/first-trimester

The 1st trimester lasts from the moment of conception and up to 13 weeks. This is an important and crucial stage of pregnancy when a new life is conceived, and the tissues and organs of the future child are formed.

www.whattoexpect.com/first-trimester-of-pregnancy.aspx

Changes in your body. A lot happens for you in the first trimester, too. A couple of the most common early symptoms of pregnancy you may experience:. Morning sickness: Unfortunately it doesn't just strike in the morning — and it typically starts up by about week 6 of pregnancy.Ginger tea or drops might help, as can small but frequent meals.

www.ucsfhealth.org/conditions/pregnancy/trimesters.html

A pregnancy is considered full-term at 40 weeks; infants delivered before the end of week 37 are considered premature. Premature infants may have problems with their growth and development, as well as difficulties in breathing and digesting. First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby's development.

www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/pregnancy/...

The first trimester of pregnancy is marked by an invisible — yet amazing — transformation. And it happens quickly. Hormones trigger your body to begin nourishing the baby even before tests and a physical exam can confirm the pregnancy.

www.onhealth.com/content/1/pregnancy_stages_trimesters

A typical pregnancy lasts 40 weeks from the first day of your last menstrual period (LMP) to the birth of the baby. It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester.

www.thebump.com/a/how-long-is-each-trimester

Some just break it up into three chunks of 13 weeks, but most add on an extra week for a grand total of 40 weeks of pregnancy. Here’s the most common breakdown, along with official weeks from the American Congress of Obstetricians and Gynecologists: First Trimester: 0 weeks–13 and 6/7 weeks (Months 1–3)

www.verywellfamily.com/pregnancy-your-week-by-week-guide-4159265

By week 6—halfway through your first trimester—your baby’s tiny face, skull, and brain start to form. His or her hands and feet make their bud-like debut on baby’s tadpole-esque body. By the close of the first trimester, your baby is more than 3 inches long and sports arms, legs, eyes, a beating heart, and more.