Increased Sense of Smell

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
does not impact
the probability of pregnancy




About this symptom

Increased Sense of Smell

While the exact reason is not entirely known, almost every pregnant woman will report an increased sense of smell during pregnancy, specifically in the first trimester. Often it is one of the first signs that a woman is pregnant. Most experts agree the culprit is those pesky hormones, combined with increased blood flow through the olfactory system sending stronger signals to the brain. It is believed that this super sensitivity to smells may also be partly responsible for the morning sickness and nausea experienced in the first trimester.


Summary of chart

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

0 dpo - 1 dpo

Slightly decreases probability of pregnancy

2 dpo - 5 dpo

Does not significantly affect probability of pregnancy

6 dpo - 8 dpo

Slightly decreases probability of pregnancy

9 dpo - 11 dpo

Does not significantly affect probability of pregnancy

12 dpo - 18 dpo

Slightly increases 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 (-17%)
13 dpo 1.3 times more (+23%)
14 dpo 1.3 times more (+29%)
15 dpo 1.3 times more (+29%)
16 dpo 1.3 times more (+22%)
17 dpo 1.2 times more (+18%)
18 dpo 1.2 times more (+17%)
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.

OhBoyOrGirl  6 years ago
Everything to me smells like onions "strange" 7dpo-9dpo so far..

Polish74  7 years ago
5-6dpo..strong sense of smell last couple of days

mamax4  7 years ago
7dpo strong sense of smell this morning.

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