With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pregnancy symptoms include missed periods, tender breasts, nausea and vomiting, hunger, and frequent urination.
text_B: Pregnancy , also known as gestation , is the time during which one or more offspring develops inside a woman .. offspring. offspring. woman. woman. A multiple pregnancy involves more than one offspring , such as with twins .. offspring. offspring. multiple pregnancy. multiple birth. Pregnancy can occur by sexual intercourse or assisted reproductive technology .. assisted reproductive technology. assisted reproductive technology. sexual intercourse. sexual intercourse. Childbirth typically occurs around 40 weeks from the last menstrual period -LRB- LMP -RRB- .. last menstrual period. last menstrual period. Childbirth. Childbirth. This is just over nine lunar months , where each month is about 29 1 / 2 days .. lunar months. lunar months. When measured from conception it is about 38 weeks .. conception. fertilisation. An embryo is the developing offspring during the first eight weeks following conception , after which , the term fetus is used until birth .. offspring. offspring. conception. fertilisation. embryo. embryo. fetus. fetus. Symptoms of early pregnancy may include missed periods , tender breasts , nausea and vomiting , hunger , and frequent urination .. nausea and vomiting. Morning sickness. Pregnancy may be confirmed with a pregnancy test .. pregnancy test. pregnancy test. Pregnancy is typically divided into three trimesters .. The first trimester is from week one through 12 and includes conception .. conception. fertilisation. first trimester. first trimester. Conception is when the sperm fertilizes the egg .. The fertilized egg then travels down the fallopian tube and attaches to the inside of the uterus , where it begins to form the embryo and placenta .. embryo. embryo. fertilized egg. fertilized egg. fallopian tube. fallopian tube. uterus. uterus. placenta. placenta. The first trimester carries the highest risk of miscarriage -LRB- natural death of embryo or fetus -RRB- .. embryo. embryo. fetus. fetus. first trimester. first trimester. miscarriage. miscarriage. The second trimester is from week 13 through 28 .. Around the middle of the second trimester , movement of the fetus may be felt .. fetus. fetus. At 28 weeks , more than 90 % of babies can survive outside of the uterus if provided with high-quality medical care .. uterus. uterus. babies can survive outside of the uterus. Fetal viability. The third trimester is from 29 weeks through 40 weeks .. Prenatal care improves pregnancy outcomes .. Prenatal care. Prenatal care. Prenatal care may include taking extra folic acid , avoiding drugs and alcohol , regular exercise , blood tests , and regular physical examinations .. Prenatal care. Prenatal care. folic acid. folic acid. Complications of pregnancy may include high blood pressure of pregnancy , gestational diabetes , iron-deficiency anemia , and severe nausea and vomiting among others .. nausea and vomiting. Morning sickness. high blood pressure of pregnancy. hypertensive disease of pregnancy. gestational diabetes. gestational diabetes. iron-deficiency anemia. iron-deficiency anemia. severe nausea and vomiting. hyperemesis gravidarum. Complications of pregnancy. Complications of pregnancy. Term pregnancy is 37 to 41 weeks , with early term being 37 and 38 weeks , full term 39 and 40 weeks , and late term 41 weeks .. After 41 weeks , it is known as post term .. post term. Postterm pregnancy. Babies born before 37 weeks are preterm and are at higher risk of health problems such as cerebral palsy .. preterm. preterm. cerebral palsy. cerebral palsy. Delivery before 39 weeks by labor induction or caesarean section is not recommended unless required for other medical reasons .. Delivery. Childbirth. labor induction. labor induction. caesarean section. caesarean section. About 213 million pregnancies occurred in 2012 , of which , 190 million were in the developing world and 23 million were in the developed world .. developing world. developing world. The number of pregnancies in women ages 15 to 44 is 133 per 1,000 women .. About 10 % to 15 % of recognized pregnancies end in miscarriage .. miscarriage. miscarriage. In 2013 , complications of pregnancy resulted in 293,000 deaths , down from 377,000 deaths in 1990 .. Common causes include maternal bleeding , complications of abortion , high blood pressure of pregnancy , maternal sepsis , and obstructed labor .. high blood pressure of pregnancy. hypertensive disease of pregnancy. abortion. abortion. maternal bleeding. maternal bleeding. maternal sepsis. maternal sepsis. obstructed labor. obstructed labor. Globally , 40 % of pregnancies are unplanned .. unplanned. Unintended pregnancy. Half of unplanned pregnancies are aborted .. unplanned. Unintended pregnancy. aborted. abortion. Among unintended pregnancies in the United States , 60 % of the women used birth control to some extent during the month pregnancy occurred .. birth control. birth control
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