Something isn't adding up

mariemartin813

Maybe someone can help me out lol I suck at math but I used a couple caculators trying to find out when I concieved. I thought I had all my dates on track, when I ovulated and when I could test blah blah blah. So I got my BFP (big fat positive (pregnancy test)) Aug. 7 and my LMP was July 14th and i went for my first U/S (ultrasound) on Sep 10 and measured at 6 weeks 3 days. I'm currently 7 weeks. But that would mean by estimate I concieved around Aug 9th which makes no sense. Cause I tested August 7th...what am I mixing up here...I literally spotted the day I ovulated and had cramping as well. And then took my first test 8dpo on Aug.7

dpchickens

PG math can be difficult.  So if on Sept you're dating 6 weeks and 3 days, then you'd conceived around July 27... and if your last AF was July 14, that's about right.  

Sometimes you could be off several days, and sometimes the early scans show a slower developing fetus. Either is possible, and as long as your doctor isn't worried, you probably shouldn't be either.  Good luck!

harpseal135

As I was told, dating (even early) is not an exact science - they are approximations.  Though the earlier the scan the closer the approximation. 

m6agua

mariemartin813 said:

Maybe someone can help me out lol I suck at math but I used a couple caculators trying to find out when I concieved. I thought I had all my dates on track, when I ovulated and when I could test blah blah blah. So I got my BFP (big fat positive (pregnancy test)) Aug. 7 and my LMP was July 14th and i went for my first U/S (ultrasound) on Sep 10 and measured at 6 weeks 3 days. I'm currently 7 weeks. But that would mean by estimate I concieved around Aug 9th which makes no sense. Cause I tested August 7th...what am I mixing up here...I literally spotted the day I ovulated and had cramping as well. And then took my first test 8dpo on Aug.7

*minus ultrasound pic*

QFP

delujm0

Your dates sound like they line up to me.
 
Also you may want to either change your SN or crop that pic, because right now i know your full name, your birthdate, and that you live in the Bay Area.  I am willing to bet that i could find you on social media by googling you in under 10 minutes, so you should probably lock that down, because internet strangers can be crazy.

babyodo

delujm0 said:

Your dates sound like they line up to me.
 
Also you may want to either change your SN or crop that pic, because right now i know your full name, your birthdate, and that you live in the Bay Area.  I am willing to bet that i could find you on social media by googling you in under 10 minutes, so you should probably lock that down, because internet strangers can be crazy.

She also posted the same thread in the May 2020 BMB: https://forums.thebump.com/discussion/12746900/how-do-i-delete-this#latest 

crazypuglady

@mariemartin813

TLDR (short version)- as PPs have said- dates make sense within the realm of possibility. (According to this non-medically trained, yet well-read amateur ) You're measuring smaller- could be  normal, could not be. Best to let your Dr know of your concerns and discuss with them.

Longer more detailed version:

Let's start with the facts: You tested positive on Aug 7. (Typically a +test is only detectable within the range of 9-14 DPO. I myself have gotten positives on 9 DPO for both my pregnancies, but they were very very faint. I'll give your 8 DPO the benefit of the doubt- though it's not very common, but possible I suppose.) This means you O'd anywhere from July 24- July 30. (Forget about cramping and bleeding for O... that could have been caused by anything and not necessarily the exact point of O.) If the first day of your LMP was July 14th- that means you O'd somewhere between CD 11 and CD 17 (a very normal range of time.) Your LMP and test dates make sense.

According to your LMP- at the time of your +test you dated 3w3d pregnant. (Drs use LMP for dating because it's almost impossible to know when conception actually takes place.) So at your US, you would have been 7w+6 if you go with LMP dating. You measured 6W+3. There's a variety of reasons why you measured smaller.   Later implantation = smaller embryo on US. Maybe the growth rate is a little off. Maybe the measurement done by the US tech was off (I don't know the margin of error associated with US measurements.) Maybe it's a combo of several factors. **TW** Or maybe- it's  an non-viable embryo End TW**

Did they detect a heartbeat? Did they mention they were concerned about size? Did your Dr ask for a follow up US to see if the embryo is growing? Or were they not concerned? As pp have said, if it didn't bother your healthcare professionals, it's probably not worth worrying about at this point. Measurements can be off- EDD is only an estimation- not an exact science. No one here can substitute for a trained medical professional working on your specific case. If you are concerned, I would contact your OB's office.

wend12345

During my first pregnancy the US tech explained to me that they give you the date that they expect you will deliver, but they also say it can be off by anywhere up to three weeks

lovesclimbing

wend12345 said:

During my first pregnancy the US tech explained to me that they give you the date that they expect you will deliver, but they also say it can be off by anywhere up to three weeks

Yup. There's a reason full term is considered anywhere from 37 to 42 weeks.