My bestfriend asked me if she had her last period on the 2nd of oct. through the 5th?

Question

She had sex on the 6th with her boyfriend whom she was having problems with. She found out she was pregnant on the 5th of nov. and they did an u/s in the emergency room because she was having really bad cramps and they told her that she was five weeks pregnant. Her due date was set july 9th. She was already nervous about when her and her boyfriend did it and was scared about missing her next period. Then she told me that she made a big mistake and slept with a guy she had been talking to for a few months on the 19th of october. Before she had sex with him she said that she was already feeling pregnant and knew something wasn't right because of the bad cramps she had been having and her sore boobs. I told her i know that due dates made upon the first day of the last period. She wants to know is it possible that it could be 2nd guy baby even though she know her boyfriend came in her. She said she had her u/s and the due date was still 7/9/7. I told her more than likely it's her boyfriend

Answer 1

There is a very slight possibility the 2nd person is the father of her baby, but according to the calculations it is more than likely her boyfriend's child. Only way to know for certain is DNA test after the baby is born.