Due Date Calculator After Ivf

IVF Due Date Calculator

Select either your Egg Retrieval Date or Embryo Transfer Date.

— Select Event Type — Egg Retrieval Date 3-Day Embryo Transfer 5-Day Embryo Transfer

function calculateDueDate() { var eventDateInput = document.getElementById("eventDate").value; var eventType = document.getElementById("eventType").value; var resultDiv = document.getElementById("result"); if (!eventDateInput || eventType === "") { resultDiv.innerHTML = "Please select both the Date of Event and the Type of Event."; resultDiv.style.backgroundColor = '#f8d7da'; resultDiv.style.borderColor = '#f5c6cb'; resultDiv.style.color = '#721c24'; return; } var dateParts = eventDateInput.split('-'); var year = parseInt(dateParts[0]); var month = parseInt(dateParts[1]) – 1; // Month is 0-indexed var day = parseInt(dateParts[2]); var baseDate = new Date(year, month, day); var daysToAdd; switch (eventType) { case "eggRetrieval": daysToAdd = 266; // 38 weeks from egg retrieval (equivalent to conception) break; case "3dayTransfer": daysToAdd = 263; // 37 weeks + 4 days from 3-day embryo transfer break; case "5dayTransfer": daysToAdd = 261; // 37 weeks + 2 days from 5-day embryo transfer break; default: resultDiv.innerHTML = "Invalid event type selected."; resultDiv.style.backgroundColor = '#f8d7da'; resultDiv.style.borderColor = '#f5c6cb'; resultDiv.style.color = '#721c24'; return; } baseDate.setDate(baseDate.getDate() + daysToAdd); var options = { year: 'numeric', month: 'long', day: 'numeric' }; var dueDateString = baseDate.toLocaleDateString('en-US', options); resultDiv.innerHTML = "Your estimated due date is: " + dueDateString + ""; resultDiv.style.backgroundColor = '#e9f7ef'; resultDiv.style.borderColor = '#d4edda'; resultDiv.style.color = '#155724'; }

Understanding Your IVF Due Date

Calculating a due date after In Vitro Fertilization (IVF) is a bit different from a naturally conceived pregnancy. While a standard pregnancy due date is typically estimated 40 weeks (280 days) from the first day of the last menstrual period (LMP), IVF pregnancies have a more precise starting point, allowing for a more accurate initial estimate.

Why IVF Due Dates Are Different

In natural conception, the exact date of ovulation and fertilization can be uncertain. Healthcare providers use the LMP as a proxy, assuming ovulation occurs around day 14 of a 28-day cycle. However, with IVF, the exact date of egg retrieval (which is equivalent to ovulation) and embryo transfer are known. This eliminates much of the guesswork.

How the IVF Due Date Calculator Works

This calculator uses the specific dates from your IVF cycle to determine your estimated due date. The calculation adjusts the standard 40-week gestational period based on the age of the embryo at the time of transfer or the date of egg retrieval:

• Egg Retrieval Date: If you know your egg retrieval date, your due date is estimated by adding 266 days (38 weeks) to this date. This is because egg retrieval is considered the equivalent of conception.
• 3-Day Embryo Transfer: If you had a 3-day old embryo transferred, your due date is estimated by adding 263 days (37 weeks and 4 days) to the transfer date. This accounts for the embryo already being 3 days old.
• 5-Day Embryo Transfer (Blastocyst): For a 5-day old embryo (blastocyst) transfer, your due date is estimated by adding 261 days (37 weeks and 2 days) to the transfer date. This accounts for the embryo already being 5 days old.

Example Calculation:

Let's say your 5-day embryo transfer occurred on January 15, 2024:

• Start Date: January 15, 2024
• Days to Add: 261 days
• Estimated Due Date: January 15, 2024 + 261 days = October 3, 2024

If your Egg Retrieval Date was January 12, 2024:

• Start Date: January 12, 2024
• Days to Add: 266 days
• Estimated Due Date: January 12, 2024 + 266 days = October 5, 2024

Important Considerations

It's crucial to remember that a due date is always an estimate. Only about 5% of babies are born exactly on their due date. Most babies arrive within a window of two weeks before or after the estimated date. Factors such as the baby's growth, your health, and other individual circumstances can influence the actual birth date.

This calculator provides a helpful estimate, but always consult with your fertility specialist or obstetrician for the most accurate and personalized information regarding your pregnancy and due date.