Pregnancy: Ages 18-24 Community
LMP OR ULTRASOUND DUE DATE ?
About This Community:

A community of expecting mothers (18 to 24 Years Old) offering support through pregnancy and childbirth. Ask a question, join a conversation, share experiences.

Font Size:
A
A
A
Background:
Blank
Blank
Blank
Blank Blank

LMP OR ULTRASOUND DUE DATE ?

my question is , should i go by my ultrasound due date or LMP due date  ?
so, according to my period which was may 1st ( i know this for sure ) i would be due febuary 5th . this was the date ive been given for half of my pregnancy . but when i had my ultrasound at 19 weeks and some days, the ultrasound tech said the baby was measuring 18 weeks , which would change my due date to febuary 15th.  at my appointment my doctor said we would stick to my original date of feb. 5th , but then the next time i went, he went by the 15th date . so im just really confused as to which date i should go by  . it doesnt really matter to me which date it is but my first son was born premeture and i would like to know how far along i am , just incase i were to go into labour early again . people have told me that the earlier ultrasounds are the most accurate but since i had mine at 19 weeks i thought it shouldnt really matter if the baby was a week smaller or bigger . what do you think  ?
Related Discussions
6 Comments Post a Comment
Blank
1420648_tn?1295813433
Go by the ultrasound date, you don't always ovulate when you think you do which would have put your date back
Blank
202436_tn?1326477933
You should go with the original due date.  2nd and 3rd trimester ultrasounds can be off by 1 or 2 weeks either way.  If your doctor has changed your due date you should speak with him and ask him why.  The 1st trimester ultrasounds are the most accurate for dating.  Once you get into the 2nd and 3rd trimesters the measurements are based against "average" babies of that age and since babies begin to grow at different rates in the 2nd trimester it's not unusual for the dates to be off.  I'm curious as to why your doctor would refer to a new due date just based on the ultrasound being off by 1 week.  
Blank
Avatar_f_tn
thanks thats what i thought also , and another i was just thought about . when i was pregnant with my first boy i didnt understand what lmp was , i thought it was the day your last period ended  . so i gave the doctor the wrong date i was off by about a week . so i had my ultrasound at what i thought was 18 weeks but really i was 19 weeks and they never said the baby was measuring big/small . so i guess that just shows babys can range in size  ?
Blank
1194973_tn?1385507504
I agree. Go by the first due date. As said, later ultrasounds are not as accurate as early ultrasounds and can measure off.
Blank
280369_tn?1316705641
This happened to me as well, but I always stuck with the original due date since it was done in the first trimester. Once in the 2nd and 3rd trimester, it will always fluctuate a little by a week or two. So I would say go by the first due date as well.  
Blank
Avatar_f_tn
I had a scan in the first trimester which was dead on to my lmp for due date, but I had another scan at 19 weeks and the baby measured 18 and 2 days, my doctor did not change my due date he just said she may go over.  
Blank
Post a Comment
To
Recent Activity
790669_tn?1424536298
Blank
Des_a_rae Ironic? Had a dream last n... Comment
3 hrs ago
2020005_tn?1417986816
Blank
KTowne commented on KTowne's status
6 hrs ago
5575813_tn?1428253630
Blank
Hollus commented on mandaszoo's status
9 hrs ago
Blank
Weight Tracker
Track your weight throughout your pregnancy
Start Tracking Now
Blank
Pregnancy Tracker
Track your pregnancy
Start Tracking Now
Top Pregnancy Answerers
12584065_tn?1436324114
Blank
Destynee2015
Phoenix, AZ
10621669_tn?1437605024
Blank
Kailalaa
RI
Avatar_f_tn
Blank
marindamqz
Avatar_f_tn
Blank
faithanduriah
8377023_tn?1399512760
Blank
Allocate
5098230_tn?1430978379
Blank
sabbylopez
Nampa, ID
Pregnancy: Ages 18-24 Community Resources
RSS Expert Activity
233488_tn?1310696703
Blank
Marathon Running Done Over Many Yea...
May 21 by John C Hagan III, MD, FACS, FAAOBlank
233488_tn?1310696703
Blank
New Article on Multifocal IOL vs &q...
May 21 by John C Hagan III, MD, FACS, FAAOBlank
748543_tn?1371753642
Blank
TMJ/TMJ The Connection Between Teet...
Jan 27 by Hamidreza Nassery , DMD, FICOI, FAGDBlank
Top Pregnancy Answerers
12584065_tn?1436324114
Blank
Destynee2015
Phoenix, AZ
10621669_tn?1437605024
Blank
Kailalaa
RI
Avatar_f_tn
Blank
marindamqz
Avatar_f_tn
Blank
faithanduriah
8377023_tn?1399512760
Blank
Allocate
5098230_tn?1430978379
Blank
sabbylopez
Nampa, ID