How Many Months Pregnant Am I Based on My Last Period? - Obstetrics and Gynecology

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How many months pregnant?


If your menstrual period started on August 14 and ended on August 20, and you took a pregnancy test on September 20 that showed one line (negative), but a subsequent test on October 20 showed two lines (positive), it is likely that you conceived sometime after your last period in August.

Typically, pregnancy is calculated from the first day of your last menstrual period.
Since your last period started on August 14, you would be approximately 2 months pregnant as of October 20.
However, for the most accurate assessment, it is recommended to consult with a healthcare provider.

Ling, 30~39 year old female. Ask Date: 2017/10/26

Dr. Huang Jianzhong reply Obstetrics and Gynecology


The menstrual period started on August 14 and ended on August 20.
A pregnancy test on September 20 showed one line, but a test on October 20 showed two lines.
Based on this information, how many months pregnant is the patient? Answer: The patient is over 2 months pregnant.

Reply Date: 2017/10/26

More Info


To determine how many months pregnant you are based on your last menstrual period (LMP), we typically start counting from the first day of your last period. In your case, your last period began on August 14 and lasted until August 20.
Pregnancy is usually calculated in weeks, with a full-term pregnancy lasting about 40 weeks from the first day of the last menstrual period. Since you mentioned that you tested positive for pregnancy on October 20, we can use this information to estimate your gestational age.

1. Calculating Weeks Pregnant:
- From August 14 to October 20 is approximately 9 weeks.
- To break this down, from August 14 to September 14 is 4 weeks, and from September 14 to October 14 is another 4 weeks, plus an additional 6 days from October 14 to October 20.

2. Converting Weeks to Months:
- Pregnancy is often divided into trimesters: the first trimester lasts from week 1 to week 12, the second from week 13 to week 26, and the third from week 27 to week 40.

- Since you are about 9 weeks pregnant, you are still in the first trimester.

3. Months Pregnant:
- In terms of months, 9 weeks is roughly 2 months and a week.
In summary, based on your last menstrual period and the positive pregnancy test results, you are approximately 2 months and 1 week pregnant.


Additional Considerations:
- Confirming Pregnancy: It’s important to confirm your pregnancy with a healthcare provider, especially since you had a positive test result on October 20. They can perform an ultrasound to provide a more accurate gestational age and check the health of the pregnancy.


- Regular Check-ups: Regular prenatal check-ups are crucial for monitoring the health of both you and your baby. Given that you are in the early stages of pregnancy, it’s advisable to schedule your first prenatal visit if you haven’t done so already.

- Signs of Complications: Be aware of any signs that could indicate complications, such as severe abdominal pain, heavy bleeding, or unusual symptoms. If you experience any of these, seek medical attention immediately.

- Travel Considerations: If you are considering traveling, especially if it involves long distances, consult with your healthcare provider. While many women travel during early pregnancy without issues, it’s essential to ensure that you are healthy enough to travel and to understand any risks involved.

- Healthy Lifestyle: Maintain a healthy lifestyle during your pregnancy, including a balanced diet, regular prenatal vitamins (especially folic acid), and avoiding harmful substances like tobacco and alcohol.

In conclusion, you are approximately 2 months and 1 week pregnant based on your last menstrual period. It’s essential to stay in touch with your healthcare provider for ongoing support and guidance throughout your pregnancy.

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