(Closed) How long am I pregnant? Help me calculate!

posted 3 years ago in Pregnancy
Post # 2
Member
2053 posts
Buzzing bee
  • Wedding: May 2013

Your doctors will most likely use your last period as your 0 weeks pregnant / starting week 1, so I would use Monday as your start date until you are told differently by a doctor 🙂

 

Its like birthdays… I am 34 years old but am in my 35th year of life.  Most people just refer to the week that has past as how pregnant they are, not the week they are currently in.

ETA: Congratulations!!!

Post # 3
Member
18 posts
Newbee

The longer cycle won’t make a difference unless you ovulate 2 days later as well ie 16 rather than 14 days after the first day of your lmp. Unless you know when you ovulated there’s no point adjusting dates.even if you do, fertilisation could have occurred up to 5days later, so it still may not be accurate. You’ll get accurate dates at your dating scan around the 12 week mark

Post # 4
Member
941 posts
Busy bee
  • Wedding: May 2016

Interesting…so my last period was June 30 but I conceived July 14. My due date is April 6. 

I was counting myself as 1 week, but I’m really like 3 weeks???? I need to call and schedule appt with ob/gyn anyhow…guess they’ll tell me too. Is first appointment 6 weeks or 8 weeks?

I’m going to email my fam dr bc I have a couple questions anyhow and see what he says regarding how far along I am.

Post # 5
Member
9504 posts
Buzzing Beekeeper
  • Wedding: August 2012

You are 5 weeks today.

Post # 6
Member
9818 posts
Buzzing Beekeeper
  • Wedding: September 2013

Doctor’s use LMP because it is the easiest way to date a pregnancy without doing an ultrasound.  That assumes you ovulate on day 14, and doesn’t really matter how long your cycle is (whether it is 26 days, 28 days, or 30 days).  If you ovulate on another day, it is off that # of days in either direction. 

No point in trying to adjust dates unless you know 100% (via charting/temping) the exact day you ovulated.  You’ll go by the first day of your last menstrual period.  So you are 5 weeks pregnant today.

Post # 7
Member
9818 posts
Buzzing Beekeeper
  • Wedding: September 2013

summerbride2016 :  april 6 is correct and you would be 3w4days.  If you want to count O day as a starting point, count 2 weeks back from O day.  O day is 2 weeks pregnant.  Yes, you are now technically “pregnant” before you’re actually pregnant.  They are going by the life of the egg, which “begins” 2 weeks before O because that is when it starts developing (assuming you O CD 14) on CD1

Let’s say I was temping and ovulated for sure on day 17.  To be completely accurate I would say the first date of my “LMP” was actually CD4 instead of CD1.  As far as dating purposes with an OB is concerned. Your ultrasound would/should match “LMP” being CD4.

But let’s be real, most women do not know for sure when they ovulated so all the doctor’s can do is do a best guess by using LMP as a starting point.

Post # 8
Member
941 posts
Busy bee
  • Wedding: May 2016

kes18 :  Oh! Thank you, that makes so much sense!

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