Can anything be detected by vaginal ultrasound at 4 weeks and 3 days?

Answer

This would be three days after a missed period so not a lot would be visible.

ANSWER

A yolk sac would definitely be visible. Even though you are 4 weeks and 3 days pregnant your baby is only 2 weeks & 3 days old, so you won't be seeing much of a "baby" for a few more weeks.

New Answer-

At 4 weeks, nothing would really be visible Not even a yolk sac. It usually doesn't appear until week 5-6. I am 4 weeks pregnant right now and nothing has really shown up yet.