4 doctors weighed in:

How is it possible that a girl can get pregnant even before menstruating the first time?

4 doctors weighed in
Dr. Renee Harris
Obstetrics & Gynecology
1 doctor agrees

In brief: Ovulate first

Cycles start from ovulation (making an egg).
A woman ovulates two weeks before her period starts. This is true of the first period too.

In brief: Ovulate first

Cycles start from ovulation (making an egg).
A woman ovulates two weeks before her period starts. This is true of the first period too.
Dr. Renee Harris
Dr. Renee Harris
Thank
Dr. James Ferguson
Pediatrics

In brief: Basic science

Menses is a reflection of the breakdown of estrogen stimulated tissue in the womb.
This can happen before or after a girl begins to release eggs. If she releases an egg before the first menses, has intercourse & conceives, she will do so before her first menses. The conception stops menses from occuring.It happened to the 13 yo that was my first baby delivery in med school

In brief: Basic science

Menses is a reflection of the breakdown of estrogen stimulated tissue in the womb.
This can happen before or after a girl begins to release eggs. If she releases an egg before the first menses, has intercourse & conceives, she will do so before her first menses. The conception stops menses from occuring.It happened to the 13 yo that was my first baby delivery in med school
Dr. James Ferguson
Dr. James Ferguson
Thank
Dr. Adam Newman
Obstetrics & Gynecology

In brief: Ovulate before bleed

Your first menstrual flow indicates that you ovulated (and didn't get pregnant) roughly two weeks before.
So - your first cycle happens only after you don't get pregnant at your first ovulation. So, if you have unprotected sex and conceive on that first ovulation, you won't have a period.

In brief: Ovulate before bleed

Your first menstrual flow indicates that you ovulated (and didn't get pregnant) roughly two weeks before.
So - your first cycle happens only after you don't get pregnant at your first ovulation. So, if you have unprotected sex and conceive on that first ovulation, you won't have a period.
Dr. Adam Newman
Dr. Adam Newman
Thank
Get help from a real doctor now
Dr. Cindy Juster
Board Certified, Pediatrics
32 years in practice
2M people helped
Continue
108,000 doctors available
Read more answers from doctors