Chapter 3 independent questions: conception, the process of conception (optional reading: not on the exams) First trimester: from first day of last menstrual period (lmp) to 12 weeks. Events: missed period, breast enlargement, abdominal thickening. Serious problems: ectopic pregnancy, abnormal urine or blood tests, increased. Second trimester: from 12 weeks after lmp to 24 weeks after lmp. Events: weight gain, showing, fetal movements felt, increased appetite. Serious problems: gestational diabetes, excessive weight gain, increased blood. ))))))))))))pressure, rh incompatibility of mother and fetus, miscarriage 13-20 weeks, Third trimester: from 25 weeks after lmp to beginning of labor. Serious problems: increased blood pressure, bleeding, premature labor, bladder. ))))))))))))infection (b) you also need to know the information related to the italicized words on pp. 61-63 under the subheadings first trimester , second trimester , and third trimester . Pregnancy: physical condition in which a woman"s body is nurturing a developing embryo or fetus.