Do the pregnancy calculators only estimate pregnancy schedules?

There are a few reasons why the Allcalculator.net's calculators for pregnancy only estimate pregnancy schedules are:

• LMP calculation depends on a regular 28-day menstrual cycle, with ovulation occurring 14 days into the cycle. Divergence exists as this does not account for menstrual cycle length irregularities and variability in ovulation timing.
• Every woman has variations in their pregnancy week by week; even the exact time the baby develops is variable.   The pregnancy week-by-week calculator estimates your pregnancy weeks highlights.
• Complications are there, due to which the delivery timeline can be changed.

What are pregnancy stages?

Earlier pregnancy lasts about 40 weeks, and these pregnancy weeks start from the first day of your last menstrual cycle. The pregnancy weeks are divided into three trimesters. They are:

• The first trimester of pregnancy
• The second trimester of pregnancy
• The third trimester of pregnancy

The first trimester of pregnancy

During the first trimester, the body undergoes several changes. You can use an accurate pregnancy month calculator to track your 1st trimester of pregnancy. The first trimester includes:

• 1 week pregnant
• 2 weeks pregnant
• 3 weeks pregnant
• 4 weeks pregnant
• 5 weeks pregnant
• 6 weeks pregnant
• 7 weeks pregnant
• 8 weeks pregnant
• 9 weeks pregnant
• 10 weeks pregnant
• 11 weeks pregnant
• 12 weeks pregnant

There are several changes in the body, including:

• Extreme tiredness
• Tender, swollen breasts
• Mood swings
• Constipation
• Headache
• Heartburn
• Carvings
• Weight gain or loss

The second trimester of pregnancy

The 2nd trimester is easier than the 1st trimester. Your 2nd trimester is more important, considering pregnancy stages to calculate your estimated due date and key milestones based on the trimester chart. The second trimester includes:

• 13 weeks pregnant
• 14 weeks pregnant
• 15 weeks pregnant
• 16 weeks pregnant
• 17 weeks pregnant
• 18 weeks pregnant
• 19 weeks pregnant
• 20 weeks pregnant
• 21 weeks pregnant
• 22 weeks pregnant
• 23 weeks pregnant
• 24 weeks pregnant
• 25 weeks pregnant
• 26 weeks pregnant
• 27 weeks pregnant
• 28 weeks pregnant

Changes that occur during the second trimester include:

• Women have aches in the abdomen, back, groin and thigh pain
• Women have stretch marks on breasts, thighs, buttocks or abdomen
• They notice darkening of the skin around the nipples
• Women have itching on the palms, soles of feet and abdomen

The third trimester of pregnancy

Women are in the home stretch in 3rd trimester. They feel more discomfort than in the 2nd trimester of pregnancy. They find breathing difficult and head to the washroom more often. The second trimester includes:

• 29 weeks pregnant
• 30 weeks pregnant
• 31 weeks pregnant
• 32 weeks pregnant
• 33 weeks pregnant
• 34 weeks pregnant
• 35 weeks pregnant
• 36 weeks pregnant
• 37 weeks pregnant
• 38 weeks pregnant
• 39 weeks pregnant
• 40 weeks pregnant

Changes at the time of the third trimester include:

• Shortness of breath
• Heartburn
• Haemorrhoids
• Women's belly buttons may stick out
• Trouble sleeping
• Contractions which is the sign of false or real labour