GIRL AGE 20 ASKS A QUESTION
REGARDING PREGNANCY (Name undisclosed)
” . . .
i had sex with my boyfrnd on the 23rd of this month
we did not use any precautions
i took contraceptive pill immediately after 1 hr
my periods on the 14th of this month
i hve my cycle after around 28 days
plz rely asap
. . . “
The following arithmetic is to explain that your sexual intercourse (April 23, 2009) was in UNSAFE PERIOD, that is, FERTILE PERIOD.
Your periods had started on 14 th April, 2009.
of Birth Control
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Birth/Pregnancy Control by Calendar Method gives the SAFE PERIOD.
This is how your UNSAFE PERIOD is calculated by the Calendar Method.
First day of bleeding is counted as Day 1 in all the arithmetic below. Thus April 14, becomes your Day 1.
Presuming that for the last one year you have had regular Menstrual Cycles of 28 days then
your fertile period or period unsafe for pregnancy is
Calendar Method Formula
S = shortest cycle _ in the past one year (eg. it could be 27 days.)
L = longest cycle _ in the past one year (eg. it could be 29 days.)
28 – 19 = 9
28 – 10 =18
See the box —->
In the present example I have taken shortest and longest cycle as 28 days because I do not know the variation in your Menstrual Cycle.
Taking the first day you bleed as Day 1, days 9 to 18 including Day 9 and Day 18 are unsafe days. In your case April 22 to May 1, 2009, presuming 1st day of your Menses was on April 14, 2009 (Day 1).
Meaning safe days are from Day 1 to Day 7 and Day 19 to Day 28
Safe days, include the days when you bleed (have periods).
Only one egg cell (ovum) is liberated 14 days before the expected period in any Menstrual Cycle.
The Calendar Method of Birth Control takes into account the normal variation in Menstrual Cycle, the life of sperm in vivo, the life of ovum in vivo.
Thus all possible days when pregnancy can happen are taken as UNSAFE or FERTILE Days (In your case Day 9 to Day 18) in a woman who has regular menses.
What is Regular Cycle?
Regular menses accepts few days variation (+ /- 2 days). The the woman can predict her next menstrual cycle date if she has regular cycle.
What is Irregular Cycle?
Irregular menses means some times Menstrual Cycle is after 2 months, sometimes after 20 days. Usually the woman herself cannot predict when she is likely to get periods.
Is this Calendar Method foolproof?
No. Calendar Method works well, but it is not assured to be 100% definite method of birth control as per scientific studies.
What is the safest method?
The method that is nearly 100 % definite for Birth Control is Oral Contraceptive Pills that are taken daily.
Combination of Calendar Method and Use of Condom during Unsafe Periods is my choice of recommendation for newly weds who want to postpone pregnancy after wedding.
Calendar Method Formula is
S-19 = First Unsafe Day and L- 10 = Last Unsafe Day
Why not use i pill instead of OC daily pills?
Can Emergency Contraceptive Method be used whenever sexual intercourse happens as a method of pregnancy control instead of Oral Contraceptive Pills that needs to be taken daily.
The i pill is also not 100 % sure method of Birth Control and it is not 100 % safe as it contains high dose of Levonorgestrel (Progesterone) hormone.
i pill of the morning after pill is therefore not advocated as routine contraceptive method. Hence, it is called Emergency Contraceptive Pill.
Please let me know if the Calendar Method as explained above is difficult to understand?
Do you have any additional questions or issues?