Help Determing If I am the father

[BADonaldson]

I have a question for anyone who feel they may help. My Ex-Girlfriend is pregnant. We were not together at the time but she called me about a month or so ago and told me the news, she also was trying to be straight with me so she told me that she was with another man after we broke up, and was very upset because she didn't know who the father was.
That was the basic information given to me at the time...........
Updating to current information to see if anyone can help me determine if Guy 1 is the Father or Guy 2 is the father

I will be Guy 1 for all comments and questions.

I know I had sex with her on August 4, 5, and  6.  
She wasn't sure when she had sex with Guy 2 but I think she narrowed it down to the August 11 - 15  

First appointment with the doctor not sure of that date but she did not get a ultrasound done at that time
She did talk to the doctor and explained to him vaguely the situation I think. I don't know how this works but I think
he estimated that she ovulated on the 7th of August if I am not mistaking.

On September 15, she went to the doctor got an ultrasound and talked to the doctor again. I am not sure how any of this works but I think the doctor told her that this was the most accurate ultrasound (not sure why) and I guess they measured and came to the determination that at that time she was  7 weeks pregnant, cant remember the days

When she spoke to the doctor this time from my understanding he could tell her more accurately now that she ovulated (August 9) and that from this determination it was more likely that Guy 1 would be the father

I am not sure how to determine any of this or even if it possible to narrow down. I know I am helping her through this
and praying that the child is mine. I love the woman and will be there for her either way. With that being said I am having trouble with the idea (if its not my kid) being a father to him and rasing him like hes my son.
She already has a son with her x-husband and that's ok with me, but these circumstances are different its hard to explain how I feel.  

Anyhow any advice, or knowledge for someone who has no idea about this subject would be very appreciative
thanks
GUY 1

[AnnieBrooke]

Hi, BADonaldson, did the doctor give your ex an estimated due date at either appointment?  And can you get the exact info from the ultrasound regarding how many weeks and days she was on what ultrasound date?

[madisondeforest]

her first ultrasound will be most accurate if it is under 10 weeks. because all embryos  grow at the same rate/growth is the same. after 10 weeks they can take on genetics and start growing faster or slower depending on whatevercircumstances. I dont know how accurate ovulation dates are just by guessing. I dont believe there is anyway a doctor can tell you for certian her exact day of ovulation. just a guess really but they can narrow it between like 5 days im pretyysure. I believe these dates are a little to close and you might have to  a dna test done . but I am no expert.