conception

I had sex with a partner on jan 19, then had sex with a second parnter on jan 25, 27 and 30th of jan.  then had sex with the first partner on feb 5.  i do not know the date of my lmp. a vaginal unltrasound put me at exactly 8 weeks when i went to the doctor on march 12.  he says according to ultrasound, conception was appx jan 28. how accurate is this?

[RAWINA]

Not very accurate. There is a chance for either one of the partners 50/50 cance.
I don't want to judge you, but try to keep one partner if you are trying to get pregnant for the sake of your health and the baby