What is my gestational age given my last menstrual period (LMP) was March 31, 2025?

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Last updated: May 12, 2025View editorial policy

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From the Research

Based on your last menstrual period starting on March 31,2025, you are not currently pregnant, as the date provided is in the future. If we were to consider a different date, such as March 31,2024, and today being May 12,2025, you would be approximately 14 months pregnant, which is not biologically possible. Pregnancy dating conventionally begins from the first day of your last menstrual period, even though conception typically occurs about 2 weeks later, as stated in the study 1. This method is used because the exact date of conception is often difficult to determine. If you suspect you are pregnant, you should take a home pregnancy test, which can detect pregnancy as early as a few days after a missed period, according to general medical knowledge. For the most accurate assessment of your pregnancy stage, I recommend scheduling an appointment with a healthcare provider who can perform proper dating through clinical examination and possibly ultrasound, as suggested by the most recent and highest quality study available 1. Some key points to consider during pregnancy include:

  • Folic acid supplementation to prevent neural tube defects, as discussed in studies 2, 3, and 4
  • Maintaining a healthy diet, as recommended in study 2
  • Screening for asymptomatic bacteriuria, sexually transmitted infections, and immunity against rubella and varicella, as recommended in study 1 However, these points are not directly relevant to determining the current stage of pregnancy based on the last menstrual period. The most important factor in determining pregnancy stage is the date of the last menstrual period, and I strongly advise against relying solely on this method for accurate pregnancy dating, as it may not provide a precise estimate of gestational age, as implied by study 1. Instead, ultrasound examination is the most reliable method for determining gestational age and monitoring fetal development, as generally accepted in medical practice.

References

Research

Prenatal Care: An Evidence-Based Approach.

American family physician, 2023

Research

The use of folic acid for the prevention of neural tube defects and other congenital anomalies.

Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC, 2003

Research

Folic acid in obstetric practice: a review.

Obstetrical & gynecological survey, 2011

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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