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.
5 weeks is the earliest most women get theirs (3 weeks after conception). They will have to do a vaginal ultrasound to be able to see anything and it won't look like a baby yet.
Fetal heartbeat
You really need to talk to your doctor or the person who did the ultrasound about this.
I understand what you are saying when you say messuring, they messure the sac and it calculates what the size is to get the age of the sac/fetus.
Be patient.
Most doctors will not see you before 8 weeks, so there may be some evidence by then.
week # 10==================== Using a Doppler ultrasound, the fetal heart can be detected at around the 6th - 7th week of pregnancy these days.
I just had this happen. I am 4-5 weeks and had a vaginal ultrasound and nothing showed. The ultrasound specialist, radiologist, er dr and an obgyn all told me that's normal around this time. I went back for bloodwork the next day and my HCG levels doubled. Good Luck. =) They have my "official" ultrasound scheduled at about 10 weeks.
ABout 5 to 6 Weeks, not much there to see really. They are tiny tiny then. God bless
my step sister had a baby and she had her first ultra sound at 2 months so yes i believe it's still early. Actually I had an Ultrasound done at 5 weeks and 5 days. They were able to see the sac, baby and pick up the heart beat at 122 bpm. So no, it it not too early to get an ultrasound.
You could but keep in mind that it could also very much change depending on how the baby is measuring at the midway ultrasound. Even then the due dates are just estimates!
It is not likely, the most you would see is the gestational sack. The heartbeat cannot even be detected until week 5.