there's no such thing as 1-2 weeks pregnant. if that's what you were told they must have meant that was the baby's gestational age, which would've meant you were 3-4 weeks pregnant. it's very confusing but the first 2 weeks of your pregnancy, you're not actually pregnant yet.

so according to your u/s you're 25 weeks, which means you would've conceived approx 23 weeks ago.

does this make sense? i'm sorry, i'm not good at explaining things.

(i'm hoping someone else will reply to this and explain it better.)

Bridget explained it fine.

25 weeks pregnancy is the same as 23 weeks of gestation.

pregnancy is counted from the first day of your last menstrual period (based on a 28 day cycle).
so you actually ovulate at the end of week 2 of the pregnancy, and implantation of the embryo takes place around the middle/end of end of week 3.

This is why for an accurate pregnancy test it is best to wait until your period is missed.
When you miss your period you are said to be 4 weeks (approx) pregnant.
At this point the embryo is of 2 weeks gestation and may have been implanted for as little as 4 days.

I took a clearblue indicator test on tuesday the 10th March which dated my conception at 1-2 weeks ----Or 3-4 weeks pregnant.

I dont know the date of my LMP, how else can i calculate an estimated due date?

Go see your doctor. They will calculate it by the size of your uterus or ultrasound.

Thanks Mabel
Yeah my appt is on wednesday morning.
It was so easy with my first child i knew the date of my LMP....
This is a new relationship, and wasnt planned, but we're happy about it...shocked but happy lol