ultrasound accuracy

[sonya33]

I am wondering how accurate transvanginal ultrasounds are? and if it is possible for them to be off by a whole month? or if it is even possible for a fetal heart beat to be dectected at 4 weeks? please help me out because i am not sure when i exactly ovulated and i really question the doctors estimates.

[alaysha]

Just to let you know when you are pregnant they tack on an extra 2 weeks. So when you find out you are pregnant you concieved 2 weeks before but they are counting you as already being at 4 weeks. Reason is that its easier to date from your lmp than conception since a lot of people don't know when they ovulate.

[SunWorshiper_26]

No heartbeat until week 6-7. If your ultrasound was off by a whole month at four weeks that would mean you haven't even ovulated yet you still have AF and not pregnant.

[AnnieBrooke]

What is the issue, exactly?  Did the doctor not see something and you expected it, or did he see something when you didn't expect it yet?

[Clysta]

No it won't be off by a month. Early ultrasounds are normally no more than a week or so off. Like said above you would be lucky to see anything at 4 weeks pregnant, let alone a heartbeat.

[gem111]

Hi
It realy does depend how good the machine is. I had one at 4 weeks they could only see an empty sac but only just and they still wasnt sure it is was there! No a heartbeat can not be found at 4 weeks you would be extremely lucky to see anything.

Yes they can be different from what you expect.