How accurate are sonograms

[Anxiousmind28]

I had unprotected sex with guy a on march 22 and my ex throughout the whole month of april. If I recall correctly  the first day of my last period was aproximately april 3 and was lighter than usual. I found out I was pregnant on May 5 and was hospitalized. My pregnancy is high risk and I am being monitored very closely. My first sonogram was done on May 10 while in the hospital and they we're only able to see a sack and guaranteed me the dates of conception we're between april 14-19. I have had numerous sonograms since then from 2 different institutions and all dates have coincided thus far but for some reason I cannot shake the feeling that they might be wrong. I really hope that my ex is the father of this baby because he has been by my side and very supportive every step of the way. The reason I am unsure is because in my experience I've known doctors to have been wrong before and  I vaguely remember the night of March 22 but I believe that guy A may have ejaculated in me, that and the fact that my period was lighter than usual and my ex never did ejaculate inside of me . I'm prone to anxiety and this issue has kept me up for the past few months now and I just would like to hear another opinion on the matter

[AnnieBrooke]

Hi, Anxious.  Let's lay this out.

Evidence that the baby is the age the doctors say:
1.  They saw only a sac on May 10, not an embryo moving around with a beating heart.
2.  On May 10, they would have seen an embryo moving around doing somersaults and with a heartbeat, if you had gotten pregnant on March 22.  
3.  Numerous sonograms from different institutions read by different doctors have concurred with the conception date you were given.  

- VERSUS -  

Evidence the wrong guy is the dad:
1.  You feel anxious.  
2.  You feel doctors have been wrong before.

(Regarding the last point, I might add that it is one thing to feel like sometimes doctors are wrong on the subtle aspects of some disease when it is first presented.  It is definitely another to feel like a doctor looking right at an ultrasound of a 7-week embryo or a 10-week embryo or a 5-week embryo would not be able to tell what he is looking at.)

Anyway, especially if the sex with the undesired guy was something she is now ashamed of or trying to hide, it's not uncommon for a woman to obsess over the possibility of the father being the wrong person, even in the face of all evidence.  If you have an anxious feeling that you can't shake, and have had repeated medical evidence that everything is OK with the date, and the anxious feeling has not gone away, it is likely the issue is not so much paternity as something else, possibly guilt or the burden of hiding your past behavior.  It might be a good idea to talk those things over with a counselor.

[Anxiousmind28]

Just wanted to add that the ultrasound done on may 10 put me at 5 weeks with a due date of january 10th