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Most of the images can be obtained by transabdominal ultrasound (this involves scanning through your lower abdomen) using a probe and gel on your skin. Sometimes if the pregnancy is early or better images of your uterus or ovaries is required a transvaginal ultrasound scan is required.
This involves an internal probe being gently placed into the vagina with a sterile protective sheath (usually less discomfort than a PAP smear) This allows better images as the probe lies closer to these structures.
The best time to establish this date is at the scan you are offered between 11 weeks and 2 days and 14 weeks plus 1 day,” Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP. “My 1st scan with this baby put me 1 week earlier than I thought I was.
But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue... Babies are ready when they're ready - try not to worry (easier said than done).” But Nigel also says that the estimated (and that is all it is) date is normally accurate plus or minus about a week.
If you have been breast feeding or have recently stopped the oral contraceptive pill you may have had an unusual cycle so you may not be sure of your LMP.