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During the third trimester of pregnancy, thinning of the lower uterine segment or contractions caused by cervical dilation can increase the amount of stress placed on the placental attachment to the uterine wall. In patients with placenta praevia, these stresses can cause detachment of the placenta from the uterine wall causing haemorrhaging.
Hemorrhoids are common in pregnancy as a result of constipation and increased intra-abdominal pressure. Hemorrhoids can cause bleeding, pain, and itching. [31] Treatment is symptomatic, including improving underlying constipation. Symptoms may resolve spontaneously after pregnancy, although hemorrhoids may remain in the days after childbirth. [32]
1.3% of abortions occur after 21 weeks of pregnancy in the US. Although it is very uncommon, women undergoing surgical abortion after this gestational age sometimes give birth to a fetus that may survive briefly. [55] [56] [57] The periviable period is considered to be between 20 and 25 weeks gestation. [58]
The third trimester is defined as starting, between the beginning of week 28 (27 weeks + 0 days of GA) [37] or beginning of week 29 (28 weeks + 0 days of GA). [4] It lasts until childbirth . Timeline of pregnancy, including (from top to bottom): Trimesters, embryo/fetus development, gestational age in weeks and months, viability and maturity stages
Vaginal bleeding early in pregnancy may also be a sign of a threatened abortion, which is when there is light to moderate vaginal bleeding but the cervix is still closed. Threatened abortion does not mean that miscarriage is inevitable; about 50% of women with bleeding before the third trimester will progress to a live birth. [26]
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Absence of embryo with heartbeat at least 11 days after an ultrasound scan that showed a gestational sac with a yolk sac. Absence of embryo with heartbeat 7–10 days after a scan that showed a gestational sac with a yolk sac. [110] [111] Absence of embryo at least 6 weeks after last menstrual period. [110] [111]
If a pregnant woman has already been diagnosed with pre-eclampsia during the current pregnancy and then develops a seizure, she may be assigned a 'clinical diagnosis' of eclampsia without further workup. While seizures are most common in the third trimester, they may occur any time from 20 weeks of pregnancy until 6 weeks after birth. [50]