I have been on birth control (Yasmin) for
almost 14 months now. I have never missed
a period...until this month. And I have
been taking my pill every day, around the
same time (6pm) this whole month. My
husband and i did have unprotected sex
twice on the 19th of March and 20th of
March.
I am 3 or 4 days overdue on my
menstruation and I did a pregnancy test
this morning, but it was negative. I
could feel my body preparing for
menstruation, but nothing has happened
thus far! Should I be worried? Is it
abnormal to have this? Is it possible that
I am pregnant?
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DoctorAnswer
Doctor Answer
Joined: 19 Dec 2005 Posts: 16777211
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Birth Control Answer A3931 Posted: 04-11-08 11:38am
The result from a pregnancy test, that is
made 4 days after your period missing, is
valid so, you are probably not pregnant.
That is understandable if we have in mind
that birth control efficiency is over 99%.
A period occurs when hormone levels
(estrogen and progesterone) drop. When
using birth control pills, a period occurs
when you start using the last 7 inactive
pills (in 28 pills pack) or make a 7 days
pause (in 21 pills pack). Sometimes
cycle/period irregularities are possible
even when using birth control pills but
there is nothing to worry about. Several
things can disturb the hormonal balance
including stress. Presence of functionally
active ovarian cysts can also cause such
cycle irregularity. In that case, a period
can be delayed as long as the cyst
persists (a few months usually).
You can do another pregnancy test for sure
and, if it is still negative, you can
continue taking the pills. If a period is
delayed more than 2 months, you may want
to consult your gynecologist.
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