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How Do I Figure out How Many Months Pregnant I Am?

By Anna Assad ; Updated July 18, 2017
A positive pregnancy test laying next to booties and a pacifier.

Your pregnancy is typically measured in weeks, so you must calculate to figure out how many months pregnant you currently are. Doctors typically set due dates at 40 weeks from the first day of your last period, with trimesters dividing the weeks. Your first trimester is weeks 1 through 12, the second trimester is weeks 13 through 26, and the third trimester is week 27 until you have the baby. You can use the date of your last period to estimate what month of pregnancy you're in.

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Write down the date of the first day of your last period. The more accurate you are on the date, the more accurate your calculations are. Try looking around the house for reminders -- such as a receipt for feminine hygiene products -- if you can't remember the exact day.

Add one week to the first day of your last period. For example, if August 17 was the first day of your last period, one week later is August 24. Mark the date "start date."

Count the number of weeks between the start date and the current date on a calendar. Every time you pass four weeks from the start date, you are another month pregnant. For example, if your start date is August 24 and it is now October 31, you are around two months and one week pregnant.

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About the Author

Anna Assad began writing professionally in 1999 and has published several legal articles for various websites. She has an extensive real estate and criminal legal background. She also tutored in English for nearly eight years, attended Buffalo State College for paralegal studies and accounting, and minored in English literature, receiving a Bachelor of Arts.

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