.pregnancy-calc-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 12px;
background-color: #fff9fb;
box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.pregnancy-calc-header {
text-align: center;
margin-bottom: 25px;
}
.pregnancy-calc-header h2 {
color: #d81b60;
margin-bottom: 10px;
}
.pregnancy-calc-form {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 25px;
}
.pregnancy-calc-group {
display: flex;
flex-direction: column;
}
.pregnancy-calc-group label {
font-weight: 600;
margin-bottom: 8px;
color: #444;
}
.pregnancy-calc-group input, .pregnancy-calc-group select {
padding: 12px;
border: 2px solid #fce4ec;
border-radius: 8px;
font-size: 16px;
outline: none;
transition: border-color 0.3s;
}
.pregnancy-calc-group input:focus {
border-color: #f06292;
}
.pregnancy-calc-btn {
grid-column: span 2;
background-color: #d81b60;
color: white;
padding: 15px;
border: none;
border-radius: 8px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
.pregnancy-calc-btn:hover {
background-color: #ad1457;
}
.pregnancy-result-card {
display: none;
background-color: #ffffff;
padding: 20px;
border-radius: 10px;
border-left: 5px solid #d81b60;
margin-top: 20px;
}
.pregnancy-result-card h3 {
margin-top: 0;
color: #d81b60;
}
.result-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 15px;
margin-top: 15px;
}
.result-item {
background: #fff0f5;
padding: 15px;
border-radius: 8px;
}
.result-label {
display: block;
font-size: 14px;
color: #880e4f;
margin-bottom: 5px;
}
.result-value {
font-size: 20px;
font-weight: bold;
color: #333;
}
.development-info {
margin-top: 20px;
padding: 15px;
background: #fdf2f8;
border-radius: 8px;
line-height: 1.6;
}
.pregnancy-article {
margin-top: 40px;
color: #333;
line-height: 1.8;
}
.pregnancy-article h2 {
color: #ad1457;
border-bottom: 2px solid #fce4ec;
padding-bottom: 10px;
}
@media (max-width: 600px) {
.pregnancy-calc-form, .result-grid {
grid-template-columns: 1fr;
}
.pregnancy-calc-btn {
grid-column: span 1;
}
}
Your Pregnancy Overview
Estimated Due Date
–
Current Progress
–
Current Trimester
–
Days to Go
–
Baby's Development This Week:
Understanding Your Pregnancy Timeline
Pregnancy is a transformative journey that lasts approximately 40 weeks, starting from the first day of your last menstrual period (LMP). While a standard cycle is 28 days, this calculator allows you to adjust for your unique cycle length to provide a more accurate estimated due date (EDD).
How is the Due Date Calculated?
Medical professionals use "Naegele's Rule" as a standard. It assumes a 28-day cycle and adds 280 days (40 weeks) to your LMP. Our calculator refines this by adding or subtracting days if your cycle is longer or shorter than 28 days. For example, if you have a 30-day cycle, your ovulation likely occurred two days later, so we adjust your due date accordingly.
The Three Trimesters
- First Trimester (Weeks 1-12): A period of rapid cell division and organ formation. By the end of this trimester, all major organs have begun to form.
- Second Trimester (Weeks 13-26): Often called the "honeymoon phase." Morning sickness usually fades, and you will begin to feel the baby's first kicks (quickening).
- Third Trimester (Weeks 27-40): The final stretch where the baby gains weight rapidly and the lungs mature in preparation for birth.
Weekly Milestones and Baby Size
Every week brings new changes. In the early weeks (4-6), the heart begins to beat. By week 20, you are halfway there, and the baby is roughly the size of a banana. By week 37, the pregnancy is considered "early term," and the baby is ready to meet the world any day!
Important Considerations
Remember that only about 4% of babies are born on their exact due date. Most babies arrive between 37 and 42 weeks. This calculator is for educational purposes and should not replace the advice of your obstetrician or midwife.
function calculatePregnancy() {
var lmpInput = document.getElementById("lmpDate").value;
var cycleLength = parseInt(document.getElementById("cycleLength").value);
if (!lmpInput) {
alert("Please select the date of your last menstrual period.");
return;
}
var lmpDate = new Date(lmpInput);
var today = new Date();
// Normalize dates to midnight for calculation
lmpDate.setHours(0, 0, 0, 0);
today.setHours(0, 0, 0, 0);
// Standard pregnancy is 280 days based on 28-day cycle
// Adjustment = cycleLength – 28
var adjustmentDays = cycleLength – 28;
var totalPregnancyDays = 280 + adjustmentDays;
// Calculate Due Date
var dueDate = new Date(lmpDate);
dueDate.setDate(dueDate.getDate() + totalPregnancyDays);
// Calculate Time Elapsed
var diffTime = today – lmpDate;
var diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));
if (diffDays 300) {
alert("The date entered suggests the pregnancy might already be complete. Please check the date.");
return;
}
var currentWeeks = Math.floor(diffDays / 7);
var currentDays = diffDays % 7;
var daysLeft = Math.floor((dueDate – today) / (1000 * 60 * 60 * 24));
// Determine Trimester
var trimester = "";
if (currentWeeks < 13) {
trimester = "First Trimester";
} else if (currentWeeks < 27) {
trimester = "Second Trimester";
} else {
trimester = "Third Trimester";
}
// Fetal Development Logic
var devText = "";
if (currentWeeks <= 4) {
devText = "The blastocyst is implanting in the uterine lining. The foundation for the brain, spinal cord, and heart is being laid.";
} else if (currentWeeks <= 8) {
devText = "The baby is now an embryo. The heart is beating, and tiny buds are forming that will become arms and legs.";
} else if (currentWeeks <= 12) {
devText = "Your baby is now a fetus! Fingernails are forming, and the baby is starting to make small, jerky movements.";
} else if (currentWeeks <= 16) {
devText = "The baby's skeleton is starting to harden from cartilage to bone. They can now make sucking motions with their mouth.";
} else if (currentWeeks <= 20) {
devText = "You are halfway! The baby is covered in a waxy coating called vernix to protect their skin. You may feel movement.";
} else if (currentWeeks <= 24) {
devText = "The baby's lungs are developing surfactant, which helps them stay open. Their taste buds are now functional.";
} else if (currentWeeks <= 28) {
devText = "The baby can open and shut their eyes. They are starting to practice breathing by inhaling amniotic fluid.";
} else if (currentWeeks <= 32) {
devText = "The baby is gaining weight quickly and layer of fat is forming under the skin. Most internal systems are well-developed.";
} else if (currentWeeks 0 ? daysLeft : 0) + " Days";
document.getElementById("resDevelopmentText").innerText = devText;
// Show result
document.getElementById("resultArea").style.display = "block";
document.getElementById("resultArea").scrollIntoView({ behavior: 'smooth' });
}