Reasons for Having a Period Every Two Weeks

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The menstrual cycle occurs in all females from the onset to puberty (average age 11 or 12 years) to the menopause in middle age (average age between 45-55). The lining of the uterus is shed via vaginal bleeding when a girl or woman has not conceived a pregnancy.

The menstrual period lasts between two days and seven days, usually occurring once every 28 days, although anything from once every 24 days to once every 35 days is considered normal.

If you are having a period more than once every 24 days, it is considered an irregular cycle.

Having a period once every two weeks, or twice a month is abnormal and you should see your doctor because you may become anemic if you are having very frequent periods. They are sometimes a sign of infection or other medical problem that would need treatment.

Reasons for a period every two weeks could be:

• Dramatic weight loss or gain -- This changes the hormones in the body and these are responsible for directing when the period will start.

• Excessive exercise -- This too disrupts hormones.

• Stress -- Exams, family argument, financial worries, divorce, even a holiday can cause a temporary change in your menstrual cycle.

• Illness and/or medications -- Some medications can affect your cycle. Talk to your doctor about altering or stopping your medication if you think this is happening.

• Uterine problems such as polyps, cysts, fibroids or tumors (either benign or cancerous).

• Sexually transmitted infections -- These can cause bleeding in between periods which can be mistaken for a period.

• Thyroid problems -- Thyroid disease could cause a thickening of the uterine lining, resulting in more bleeding than normal.

• Reactions to contraceptive methods -- Sometimes the pill, depo provera injections or the copper-only IUD can result in a change in your cycle.

~ The pill and IUD can make you bleed in between periods, known as "breakthrough bleeding" and this may be mistaken for a period.

~ The IUD can also make your periods heavier.

~ The depo-provera injection can make your cycle irregular, however, it often stops your period altogether instead of making it more frequent.

Add a Comment68 Comments

EmpowHER Guest

i was taking sulfamethox for three days and metrondizale for seven days so it was the whole five days when i was on my period but i also took azithromycin on my last day of my period and after i stoped my period i started taking nitrofurantoin mcr for five days

April 24, 2015 - 12:36am
EmpowHER Guest

hi, i got my period on april 3 and lasted five days but the fifth day i didnt bleed all day til late at i started bleeding but only a little and today april 22 when i woke i started feeling light cramps and when i went to pee i saw i was bleeding so i guess i started my period again this the first time it happens . but about two weeks ago after i started my period i was also taking medication could this have caused it for me to tet my period again

April 22, 2015 - 4:12pm
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

What medication are you taking?


April 23, 2015 - 9:38am
EmpowHER Guest

Im 16 and 2 weeks after my cycle it started again i dont know why im worried but i think its weight lost because i am 43 kg before and suddenly now im 39 kg.. So do you think thats the reason??

April 22, 2015 - 6:56am
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Generally, extreme weight loss, and 4 kg is not extreme, causes a late or missed period.

How long have you been menstruating? Have your cycles been regular up until now?

If this pattern continues, speak with a parent. You may need to be evaluated by a physician for a possible hormonal imbalance.


April 23, 2015 - 9:36am
EmpowHER Guest

My periods are always normal however last month it came on time and lasted the normal time but on D14 I started bleeding again not a lot but it was very light and it lasted for question is if I am TTC and D14 is the day I was suppose to ovulate and my period came how do I begin to track my cycle again? Also could this be a sign of pregnancy?

April 21, 2015 - 11:15am
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Since you are trying to conceive, you need to consult your gynecologist about this second menstrual bleeding.

Did you have intercourse any time after your last period ended?

If the bleeding on day 14 was very light and ended within 4 days, this could be implantation bleeding.

Talk with your doctor. I would wait and see if your next period starts on time. If not, take a pregnancy test.


April 23, 2015 - 9:33am
EmpowHER Guest

i had my period at the start of this month and it stopped after 6 days then I got it back after gap f 4 or 5 days ? ? Do I need to see a doctor ? the bleeding has not yet stop though its 8th day since i am on my periods ? i was alot of tensed for my exams ? is this the reason ?

April 20, 2015 - 1:18pm
Maryann Gromisch RN Guide (reply to Anonymous)

Hello Anonymous,

Usually, high levels of stress cause a delay in the start of a period. Please read the article and my reply to the post below.

Any abnormal or irregular menstrual cycle needs to be evaluated by a gynecologist.


April 21, 2015 - 9:37am
EmpowHER Guest

Hellow i am 19 years i had my regular periods for 6 days but after 4 or days again i had periods and its 8th day since i am on my periods :( what is the reason ?

April 20, 2015 - 1:13pm
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We value and respect our HERWriters' experiences, but everyone is different. Many of our writers are speaking from personal experience, and what's worked for them may not work for you. Their articles are not a substitute for medical advice, although we hope you can gain knowledge from their insight.

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