Early pregnancy symptom

The chart

Comparison of how often this symptom is experienced by pregnant vs non-pregnant women.


After implantation (9 dpo+)
experiencing this symptom
the probability of pregnancy


Overall (during the luteal phase)
experiencing this symptom
the probability of pregnancy




About this symptom


Headaches in pregnancy tend to occur most frequently in the first trimester. Hormone levels rise dramatically in early pregnancy, and can contribute to headaches. Changes in your blood circulation and blood volume during pregnancy can cause increased pressure on your blood vessels. This increase requires greater fluid intake to counteract dehydration, which can be another cause of headaches. Be sure to get at least 8 glasses of water a day.

Low blood sugar could also be the culprit, be sure to eat a healthy well balanced diet, with adequate protein and iron intakes. Avoid foods that can trigger a headache: like chocolate, MSG, cheese and spicy foods. Other possibilities are stress and anxiety or not getting enough rest. Try to take time each day to relax and make sure you get enough sleep.


Summary of chart

An explanation of the affect on the probability of pregnancy for each day past ovulation or group of days.

0 dpo - 15 dpo

Slightly decreases probability of pregnancy

16 dpo - 18 dpo

Decreases probability of pregnancy


Detailed breakdown by DPO

Shows data for days where differences are meaningful.

Day past ovulationPregnant vs non-pregnant
0 dpo 1.2 times less (-14%)
7 dpo 1.2 times less (-14%)
8 dpo 1.2 times less (-15%)
9 dpo 1.2 times less (-16%)
10 dpo 1.3 times less (-18%)
11 dpo 1.3 times less (-20%)
12 dpo 1.3 times less (-21%)
13 dpo 1.3 times less (-23%)
14 dpo 1.3 times less (-20%)
15 dpo 1.3 times less (-20%)
16 dpo 1.4 times less (-25%)
17 dpo 1.4 times less (-29%)
18 dpo 1.5 times less (-32%)
Understanding the data

Pregnant women experience this symptom the number of times listed as often as non-pregnant. The percentage listed refers to the percentage increase or decrease between pregnant and non-pregnant.

Visit the dpo chart pages to view most common and significant positive and negative indicators of pregnancy for each day past ovulation.




What women are saying about this symptom.

MamaShaOC  11 months ago
Headaches were one of my first symptoms with both of my sons

OhBoyOrGirl  3 years ago
Had a headache since yesterday when I woke up, on 9dpo on 10dpo I still have a headache. Never really get them! Xx

member_58252  4 years ago
Light headache prob from sun I was outside when it started

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