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conception question and due date

So I did a due date calculator thing because I was bored. I am lost it says my first trimester begin on June 22 but I didn't have sex until June 29th and July 6th and my doctor told me my due date was the same as what the calculator gave me which was March 29th. I don't understand how my first trimester could of begin on the 22 if I didnt have sex until the days I listed. Sorry first time pregnancy 18 years old lol. Some one help explain? By the way my last period was June 8th but my doctor is going off something else I think. My doctor said March 29th is my due date.

THIS IS WHAT I ENTERED IN THE CALCULATOR:
Your due date is March 29, 2014.

Your baby was conceived around July 06, 2013.

Your first trimester begins June 22, 2013.
Your second trimester begins September 15, 2013.
Your third trimester begins December 29, 2013.


i also have shorter cycles 24 or 25 days long. If I enter my period date in the calculator is says march 15th but says im like 15 weeks or something

and when i enter march 29th it which is what my doctor told me i am 13 weeks and on august 11th i found out i was 7 weeks and 1 day. at the hospital.

Also when did i conceive around then? i have short cycles and i am 13 weeks
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Avatar universal
i think its cuz they were going off my last period
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Avatar universal
but i wonder why on aug 11 they told me my due date was march15 but then my doctor told me the 29th :/ so confusing lol
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Avatar universal
okay thanks(:
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13167 tn?1327194124
Right,  7 weeks one day on August 11.  That means,  you count back 5 weeks one day to determine the time when you actually were fertile and conceived.

And that's July 6.  Because you get two "free" weeks.  I know it's confusing - I think really,  you just have to accept it but not necessarily understand the counting formula.

When they do a US and measure the baby,  they add two weeks to its gestational age to try to put the "beginning" of the pregnancy where they imagine you probably began your last regular menstrual cycle.

I know I'm not describing this very clearly,  sorry.  But July 6 is the date,  if on Aug 11 they said you were 7 weeks 1 day.
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Avatar universal
regardless they still said the gestational age was 7 weeks and 1 day on august 11th
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Avatar universal
Okay, and I messed up I thought my cycles were shorter but they are longer I totally messed that up. They are 30 or 31 days long so does that mean I still conceived in July?
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13167 tn?1327194124
BTW, this system goes back to when they couldn't date a pregnancy any better than calculating from a normal menstrual cycle.

Before sonograms,  and quantitative blood tests,  all they had was when was your last period?  And then they count from there.   Now, for some reason,  they still count from there.
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13167 tn?1327194124
You conceived around July 6,  not June 6.

This gets confusing when you don't have a 28 day cycle.

Doctors calculate your pregnancy "beginning" back to the first day of your last menstrual cycle,  although they know the pregnancy doesn't actually begin until ovulation which,  in most women,  is 2 weeks after the menstrual period begins.  So in effect,  you get two "free" weeks at the beginning of the pregnancy when you weren't actually pregnant yet.

In a 28 day cycle woman,  the day her period is missed,  she's calculated to be 4 weeks pregnant (theoretically calculating back to the beginning of her period).  

So when they do an ultrasound,  and discover that you conceived 5 weeks and one day ago,  you get two free weeks and they calculate your pregnancy to be 7 weeks one day along.

Because they know you conceived 5 weeks and one day ago.

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Avatar universal
wait, they told me on aug 11th i was 7 weeks and 1 day but that was the gestational age so did i still conceive around june 6th?
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Avatar universal
i understand! (: thank you!
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13167 tn?1327194124
There's a lot of confusing stuff in your post because of how the medical community dates a pregnancy,  and your cycles are shorter so all that is kind of extraneous,  incorrect information.

You have a due date of March 29, 2014 based on something.  If they did a US at the hospital to determine how far along you were,  that's extremely accurate and points to the same exact day as your doctor is pointing to - July 6 as your most likely day of conception.  

The June 22 date of beginning your first trimester would estimate,  if you had typical 28 day cycles,  of when your last regular cycle began.  As it is,  it's meaningless for you because your cycles aren't 28 days.

The two things that seem correct,  and that matter,  are your due date March 29 and your conception date July 6.
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