Increased Breast Size

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 Breast Size

The swelling of the breasts in early pregnancy is due to the increase of hormones which cause increased blood flow to the breasts to begin the preparation for breastfeeding. The breasts may increase by a full cup size in just the first 12 weeks of pregnancy.


Summary of chart

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

0 dpo - 12 dpo

Does not significantly affect probability of pregnancy

13 dpo - 14 dpo

Slightly increases probability of pregnancy

15 dpo - 18 dpo

Increases probability of pregnancy


Detailed breakdown by DPO

Shows data for days where differences are meaningful.

Day past ovulationPregnant vs non-pregnant
14 dpo 1.3 times more (+22%)
15 dpo 1.4 times more (+31%)
16 dpo 1.4 times more (+40%)
17 dpo 1.5 times more (+48%)
18 dpo 1.6 times more (+51%)
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.

Ladychey123  2 years ago
My breast look a lil bigger 11dpo

OhBoyOrGirl  4 years ago
7dpo very tender sore swollen breast, started 2dpo also a burning feeling too!

peonies2107  5 years ago
Actually bought a bra size c, usually wears a size b.

You must log in to post a comment