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How wrong can a conception date be? Could my baby be the other guy`s?

Hello, i hope you can help me i am currently from what an early Ultrasound detected 10-11 weeks pregnant with my first child. I was happy until i realised the conception date which was around 10th September. I was only with one partner at that time. But around the beginning of August say around 5th-10th August i did have intercourse with somebody else. I of course want the father to be with whome i am currently with as i have told him it was his. So my question is how wrong can a conception date be? Could my baby be the first guys? I had my ultrasound at 5 weeks 6 days.
Thank You

Sarah...
Answer: Hi, You need to work out the first day of your last menstrual period. This will tell you when were fertile. You are usually fertile around 14 days after this date and your period is due 14 days after this date. Then you should be able to work out what happened. Best wishes, Alex
Answered: 22 Nov 2008