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The day of ovulation in the menstrual cycle can vary from woman to woman depending on their cycle length, while a scan can pinpoint the exact week and day of pregnancy based on the size of the embryo. emedicine.[Accessed January 2015] Myklestad K, Vatten LJ, Magnussen EB, et al. The length of your pregnancy may also be influenced by how long your baby took to implant when she was conceived. Length of human pregnancy and contributors to its natural variation. Most often used during the early stages of pregnancy.Standard Ultrasound – Traditional ultrasound exam which uses a transducer over the abdomen to generate 2-D images of the developing fetus .3-D Ultrasound – Uses specially designed probes and software to generate 3-D images of the developing fetus.4-D or Dynamic 3-D Ultrasound – Uses specially designed scanners to look at the face and movements of the baby prior to delivery.

Although the terms ultrasound and sonogram are technically different, they are used interchangeably and reference the same exam.The luteal phase, from ovulation onward, is typically 13 to 14 days.So let's say a woman's typical cycle is the standard 28 days, but for this cycle our hypothetical woman's follicular phase is 16 days instead of her typical 14 days.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. Babies born before 37 weeks are preterm and are at higher risk of health problems such as cerebral palsy.About 213 million pregnancies occurred in 2012, of which, 190 million were in the developing world and 23 million were in the developed world.Twins and particularly triplets are more likely to be born premature. The due date you are given at your dating scan will be more accurate than using your last period to calculate it. Pregnancy is typically divided into three trimesters.The first trimester is from week one through 12 and includes conception. 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. Around the middle of the second trimester, movement of the fetus may be felt.There are basically seven different ultrasound exams, but the principle process is the same.The different types of procedures include: Transvaginal Scans – Specially designed probe transducers are used inside the vagina to generate sonogram images.