can an ultra sound be 3 or 4 weeks off

[missajami]

Well last I moved out of state and started having the time of my life. I ended up meeting this guy, and we became very close. After 2 months we ended up having sex. Then he dissappeared. And this was around the end of October. Well between the 15 and 31 of October. And I had a period also around the end of that month. So in Nov i ended up coming back home for thanksgiving. And I end up back in the arms of the man I so dearly loved and we ended up makin love. And it was the 25th of Nov. I also had a period days before him. Then the next day I flew back to my new home out of state  and we kept in touch. Then I ended up comin back home again for Christmas and I descided I wanted to stay bc I was so badly home sick.  2 days after Christmas I became very sick  and on new years I found out I was pregnant. My due date is Aug 19, 2012.  I told the guy that I am inlove with about the Otha guy and that I was pregnant. And that I also thought that the baby was his. I also have get to get intouch with the Otha guy. At first the man that I am love wit was confused and mad but now we are together and he asked me to marry him, But I think most of this is because of the baby. I jus really want to kno how  accurate is an ultra sound, and or could it be almost a whole month off. I jus dnt wanna look like a fool.

[missajami]

Thank u guys so much I feel so much better now that I have finially told someone else other than him.

[Starzabove9]

Yeah I think it pretty safe to say its your current bfs baby. It was an entire month in between guys and your conception date was probaby the 25 of nov. I think your good.

[MissJLJ]

It wouldn't be off by that many weeks. Im due August 18th and conceived November 26th.

[Factorymomma]

Early ultrasounds are usually extremely accurate within a week.  Plus you had your period before meeting up with guy #2.  So I think it's safe to say it's his.