A missed menstruation is often the first indicator of pregnancy for many women. By the time you've missed your period, most pregnancy tests will be positive. Feeling sleepy, bloated, peeing more than usual, mood swings, nausea, and sensitive or enlarged breasts are all early pregnancy symptoms. Not everyone experiences all of these symptoms, but at least one of them is common.
The first day of your last menstrual period is used to determine your gestational age, which begins on the first day of your last menstrual period (LMP).
The term "gestational age" can be perplexing. Pregnancy is commonly thought to last nine months. It's also true that you've been expecting for roughly 9 months. However, because pregnancy is counted from the first day of your last menstrual period — around 3-4 weeks before you're truly pregnant — a full-term pregnancy normally lasts about 40 weeks, or about 10 months, from LMP.
It's very normal for many women to forget when their last menstrual cycle began. An ultrasound is the most reliable tool to determine gestational age early in pregnancy.
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