How Far Along Am I? How to Calculate Your Pregnancy Weeks

One of the first things people need to know when considering their options is how far along they are. This guide explains how pregnancy weeks are calculated, why it matters, and what to do if you're not sure.

How Pregnancy Weeks Are Counted

Pregnancy is counted from the first day of your last menstrual period (LMP) — not from the day you had sex or the day you think conception occurred.

This is important because it means:

• You are considered "pregnant" before conception even happens
• By the time you miss a period, you're already approximately 4-5 weeks pregnant by medical counting
• In a state with a 6-week ban, you may only have 1-2 weeks after a missed period before the deadline

Why Counting From LMP?

Doctors and medical guidelines use LMP because it's a reliable, consistent reference point. Ovulation and conception dates are harder to pin down precisely, but most people know (approximately) when their last period started.

How to Calculate

Step 1: Identify the First Day of Your Last Period

This is the first day of bleeding — not the last day, and not spotting. If you're not sure of the exact date, your best estimate is fine.

Step 2: Count the Weeks

Count forward from that date to today. That's how many weeks pregnant you are.

Example:

• Last period started: February 1
• Today's date: March 8
• That's approximately 5 weeks and 1 day

Step 3: Understand What This Means

• Under 6 weeks: Very early. Many people don't know they're pregnant yet.
• 6-9 weeks: Still early. This is when most medication abortions occur.
• 9-13 weeks: Medication abortion is still effective through 13 weeks (WHO guidelines). Some providers have earlier cutoffs.
• 13+ weeks: Beyond the medication abortion window. Other options may be available depending on your state.

What If I Don't Know When My Last Period Was?

This is common, especially if you have irregular periods. Here are some ways to estimate:

Think About Context Clues

• When did you last buy pads or tampons?
• Do you track anything in a calendar or app?
• Was there a holiday, birthday, or event around the time of your last period?
• When did you first notice symptoms (nausea, breast tenderness)?

Use a Pregnancy Test Timeline

• Most home pregnancy tests work starting around 4-5 weeks from your LMP (around the time of a missed period)
• If you just got a positive test and your periods are somewhat regular, you're likely 4-6 weeks
• If you've known for a while, add those weeks to 4-5

When in Doubt

If you're truly unsure, a healthcare provider can help estimate gestational age. Some telemedicine providers can work with approximate dates and help you figure it out during your consultation.

Why Gestational Age Matters

For Medication Abortion

• Medication abortion is most commonly available through 10 weeks (FDA guideline) or 13 weeks (WHO guideline)
• Different providers have different cutoffs
• The earlier you are, the simpler the process tends to be
• Success rates are highest in early pregnancy (95-98%)

For State Laws

Many state abortion laws are based on gestational age:

• 6-week bans (Georgia, South Carolina, Iowa, Florida): By the time you miss a period, you may already be past the state's deadline
• 12-week bans (North Carolina, Nebraska): More time, but still requires acting relatively quickly
• Total bans (Texas, Tennessee, Alabama, etc.): Gestational age matters for telemedicine providers' own protocols, not for state law

For Your Health

Medication abortion is very safe at all stages through 13 weeks, but knowing your gestational age helps your provider give you the right dosage and set appropriate expectations for your experience.

Common Questions

I have irregular periods — how do I calculate?

Do your best estimate. If your cycles are 35 days instead of 28, you may be slightly less far along than the standard calculation suggests. Your provider can help you figure this out.

I was on birth control — does that affect the count?

If you had breakthrough bleeding on birth control, that may not count as a "period." The count starts from your last real menstrual period. If you're unsure, your provider can help.

Can a pregnancy test tell me how far along I am?

Standard pregnancy tests only tell you if you're pregnant — not how far along. Some digital tests show "1-2 weeks" or "3+ weeks" but these refer to weeks since conception, not weeks since LMP. To convert: add 2 weeks to the test result.

What if I'm further along than I thought?

If you're past the cutoff for medication abortion (13 weeks by WHO guidelines), other options may still be available depending on your state. Organizations like AbortionFinder.org and the National Abortion Federation Hotline (1-800-772-9100) can help you explore options.

I just found out I'm pregnant — should I act quickly?

Yes, especially if you're in a state with a gestational age restriction. The sooner you start the process, the more options you have. Telemedicine consultations are available 24/7 and typically take 15-20 minutes.

Use Our Pregnancy Calculator

If you know the date of your last period, you can use our pregnancy calculator to estimate how far along you are:

Visit: southernwoven.com/en/pregnancy-calculator

When to Contact a Provider

If you're considering medication abortion:

• Don't wait to figure out the exact date — an approximate date is fine to start the process
• Providers can help you estimate during your consultation
• Acting quickly gives you the most options
• Telemedicine consultations are available 24/7

Medical Disclaimer

This guide is for educational purposes and does not replace advice from a licensed healthcare provider. For questions about your specific situation, consult a healthcare provider.

Sources: ACOG, WHO, FDA

Last updated: March 2026 Southern Woven Medical Team