Ovulation & Fertile Window Calculator

Estimate your most fertile days by providing the first day of your last menstrual period and your average cycle length. This is an estimation and not a substitute for medical advice.

${formatDate(results.fertileWindowStart)} - ${formatDate(results.fertileWindowEnd)}

Approximate Ovulation Day

${formatDate(results.ovulationDate)}

Estimated Next Period

${formatDate(results.nextPeriodDate)}

`; }; pdfButton.addEventListener('click', async () => { const pdfExportContainer = document.createElement('div'); Object.assign(pdfExportContainer.style, { position: 'absolute', left: '-9999px', top: '0', width: '700px', padding: '2rem', backgroundColor: '#ffffff', fontFamily: 'Inter, sans-serif' }); const resultsHTML = document.querySelector('.results-card').innerHTML; const lastPeriodDate = new Date(lastPeriodInput.value + 'T00:00:00'); const cycleLength = cycleLengthInput.value; pdfExportContainer.innerHTML = `

Ovulation Calculation Report

Last Period Start: ${formatDate(lastPeriodDate)}

Average Cycle Length: ${cycleLength} days

${resultsHTML}

This report provides an estimation based on the data provided and is not a substitute for professional medical advice.

`; document.body.appendChild(pdfExportContainer); try { const canvas = await html2canvas(pdfExportContainer, { scale: 2 }); const imgData = canvas.toDataURL('image/png'); const { jsPDF } = window.jspdf; const pdf = new jsPDF({ orientation: 'portrait', unit: 'mm', format: 'a4' }); const pdfWidth = pdf.internal.pageSize.getWidth(); const imgHeight = canvas.height * pdfWidth / canvas.width; pdf.addImage(imgData, 'PNG', 15, 15, pdfWidth - 30, imgHeight - 30); pdf.save('Ovulation-Report.pdf'); } catch (error) { console.error("PDF Generation Failed:", error); alert("An error occurred while generating the PDF."); } finally { document.body.removeChild(pdfExportContainer); } }); });
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