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I got this off of OB/GYN Utlrasound site. This would go for babies in general. It wouldn't matter if it were a singleton or twins.

Around 7 and 8 weeks the embryo is very well seen, and we can try to see four limbs, the head, the umbilical cord and its insertion into the embryo's body, and the location of the placenta. Measuring the length of the embryo (we call it a crown-rump length) at this stage of pregnancy gives us very accurate dating of the pregnancy, plus or minus 3 or 4 days. The further along in pregnancy the first dating is done, the less accurate it is.

twins can be seen as early as 5.5-6 weeks via vaginal u/s. At 8 weeks there is a baby with a hb and developing limbs. If no hb is seen by 8wks the pg is not viable.

Mine were detected at my 8 week ultrasound. There was 2 sacs with 2 heartbeats.

We had our first u/s at 8 weeks and you could see both babies clearly by vaginal u/s.

Our 1st u/s (internal) was at 7wks. Both were very visable with great heartrates!

mine were seen at our first u/s at 6.5wks via vaginal ultrasound and both had good heart beats.

I saw mine at my first external ultraound at 9 weeks.

I saw mine by vaginal ultrasound at 6 weeks. Both had good heartbeats.

HI SARAH, im pregnant with TRIPLETS! i found out at my first ultrasound and i was 9 weeks, and we saw more then just a sac, we saw there hearts beating and we saw the babies, althought they looked somewhat like blobs lol, but they were there! I HAD EXTERNAL AND VAGINAL ON BOTH ULTRASOUNDS, ive had 2 so far, im thinking ill probably have both everytime. who knows. GOOD LUCK.

hello sarah, i saw 2 sacs and 2 heartbeats via vaginal ultrasound at 5 weeks. my next ultrasound isn't until may 22. the wait has been agony!!