How It Is Done continued...
Record the dates of your
menstrual periods for 6 to 8 months. See if your menstrual cycle is regular and
how many days it is. If your cycle is regular and about 28 days long, you are
most likely to ovulate 14 to 15 days after menstrual bleeding begins.
To find the first day that you are likely to be fertile, take 18 away
(subtract) from the number of days in your shortest menstrual cycle. Your first
fertile day should be that many days after your menstrual bleeding begins. For
example, if your shortest menstrual cycle is 26 days long, you would subtract
18 from 26 to get 8; your first fertile day would then be the 8th day after
menstrual bleeding begins.
To find the last day that you are
likely to be fertile, subtract 11 from the number of days in your longest
menstrual cycle. Your last fertile day should be that many days after your
menstrual bleeding begins. For example, if your longest menstrual cycle lasts
31 days, you would subtract 11 from 31 to get 20; your last fertile day would
then be the 20th day after menstrual bleeding begins.
live in your vagina 3 to 5 days after sex.
- If you want to become pregnant, have sex
every day or every other day from your first fertile day to your last fertile
- If you do not want to become pregnant,
do not have sex or be sure to use another method of birth control for 1 week
before your first fertile day. In the example above, your fertile period is
from day 8 to day 20, so protect yourself from becoming pregnant for these 12
days of your cycle.
The calendar method of birth control is not the best
choice for women who have short, long, or irregular menstrual cycles. For this
reason, the calendar method alone is never recommended for birth control. It
must be used in combination with other birth control methods.
Standard days method (SDM)
On the first day of
your period, move the ring to the red bead (day 1) on the CycleBeads. Count
each day as one bead. On days 1 to 7, you can have unprotected sex. On days 8
to 19, do not have sex or be sure to use another method of birth control to
avoid pregnancy. From day 20 to the end of your cycle, you can have unprotected
sex. All brown beads are days when you are not likely to become pregnant. All
white beads are days you are likely to become pregnant. The dark brown bead
marks day 26 and the last brown bead before the red bead is day 32. The SDM
works best for women who have cycles between 26 and 32 days long.
Basal body temperature (BBT) method