Written by : Dr.M.D.Mazumdar, MD
Certain words are used repeatedly while discussing issues related to pregnancy. A brief description of the meaning of each word is given on this page.
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But these methods are accurate only if the menstrual cycle is regular and 28 +/- 2 days. If cycle length is longer, say 32 days then the extra days beyond 28 days, i.e 4 days have to be added to the EDD.
So a woman whose LMP was on the 3rd of March, but whose cycle length is 32 days will have her EDD on the 9 months +7days +4 days = 3rd December +7days+4days= 14th December. Similarly if the cycle length is less, the same number of days have to be subtracted from the calculation.
Only about 10% of women deliver on the EDD.
Most women deliver within the first week of the EDD. Delivery between three weeks before and two weeks after the EDD is considered normal.
1st Trimester - from the beginning of pregnancy till the end of the thirteenth week.
2nd Trimester - from the end of the 13th week to the end of the 26th week.
3rd Trimester - from the end of the 26th week to the end of the 40th week.
A. Cephalic Presentation There are three types of cephalic presentation.
B. Breech Presentation This is presentation in which the baby's buttocks with lower limbs present at the cervix during labor.
B. Shoulder Presentation This presentaiton is seen together with transverse lie and is not very common.
An ovum is released from the ovary approximately 14 days (12 to 16 days) after the last menstrual period. Fertilization occurs when the male sperm meets the female ovum and fuses with it to form the zygote. It usually occurs in the outer part of the fallopian tube.
The single celled zygote starts to divides in about 12 hours into 2 cells. It continues to divide into more cells as it is propelled towards the uterus by the ciliary cells lining the inner wall of the tube as well as by the movement of the tube itself. By the time it reaches the uterus it is a cluster of sixteen cells called a 'morula'.
The morula reaches the uterine cavity and becomes attached to the inner lining of the uterus (the endometrium) on the 6th day after ovulation. It begins to burrow into the spongy endometrium and by the 10th day, it is completely embedded in it and begins to develop into a baby. The process of embedding into the endometrium is called 'Implantation'.
Please click here to read more about how a pregnancy occurs
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