See more results



Mumsnet Logo
to access all these features

Get updates on how your baby develops, your body changes, and what you can expect during each week of your pregnancy by signing up to the Mumsnet Pregnancy Newsletters.


Alice535 · 25/03/2017 12:17

My question is can an ultrasound be off by a whole months cycle? Especially if done so early in the first trimester?

Blood test done 19th sept 2-3 weeks pregnant.

I had a ultrasound done 20th sept dating me at 4w 5d. There was basically an empty uterus but a cyst was in there. I didn't tell my doctor my last LMP I wanted yo be sure on the Us that it works. He said your LMP should be 18th august he was right I had a 5 day bleed then which I'm sure was just like my normal period.
I went back two weeks later and measured 6w5d saw a little jelly bean and a heart beat.
I had more US at 8-9 weeks 11 weeks 13 weeks 15 weeks 18 weeks. All measuring to the same due date given at the first US that matches to my LMP. May 25th.

So conception he said was 1st sept.

I'm not 31 weeks.

Is it possible that the bleeding could of been implation and they mistaked an 8-9w pregnancy for a 4-5 week one and that I was pregnant from my last cycle? And that all ultrasounds have been out by 4 weeks to a month?

Could this pregnant be from intercourse on august 2nd? I know sperm can live max 7 days so I took that into account for Aug 9 latest time of conception and still leaves a huge 3 week gap from the latest I cab conceive from that encounter and from the earliest I can conceive from my US and LMP 28 Aug.

surely if they are wrong I'll be due April 25th? Not may 25th ...
Could I really be 35-36 weeks pregnant and not 31 weeks.... I don't feel that far along.

If she comes close to her may due date can we rule it out? Thank you.

** before bashing me I used a,condom that night, it broke. I was separated from my current partner. And I couldn't get morning after pill because it was abroad. Got back with my current partner from the 12th august until present day.... Please help

My period august 18th was actually due 31st July but I'm guessing it was late due to my first ever cortisone shot which one known side effect is it throws off your period....

So 31 weeks, due 25th may possible time of conception 28th Aug -05 September but doctor at early ultrasound said conceived 2nd septsept last LMP 18th Aug all US due date and LMP add up plus blood test hcg level

so can we rule out sex from august 2nd?

OP's posts:
to access all these features

SarahOoo · 26/03/2017 09:35

That was kind of hard to keep up with but the five day bleed was a period, implantation bleeding isn't like that at all as far as I have ever researched.

You cannot really know for sure unless you do a DNA test or your baby looks very much like one or the other potential fathers.

Which country were you in? Just a FYI but you can get the morning after pill from a lot of European countries.

to access all these features

MadameJosephine · 26/04/2017 22:50

Hi midwife sonographer here. I think it's pretty much impossible for your scans to be 4 weeks out. Particularly in early pregnancy 4 weeks can make a massive difference to the size. For example crown rump length at 8 weeks is approx 16 mm but at 12 would be 54 mm so there's no way you could mix the two up.

to access all these features

sn318 · 01/02/2019 16:33

@Alice535 .. I know this is old now but were your ultrasounds correct? How did everything turn out?

to access all these features
Please create an account

To comment on this thread you need to create a Mumsnet account.