Thanks for your query at DoctorSpring.com.
Condoms have a failure rate that is quite variable - right from 3 - 18 %.
So yes, technically speaking, chances of failure do exist, but the chances of being pregnant from man 1 is obviously much high, as he ejaculated inside you, and you were on your fertile day.
Are you pregnant currently ?
As the timeframe is so narrow ( both encounters within 24 hours ) to know with absolute certainty, the only definitive way is to have a DNA paternity test.
To answer your question specifically, chances of man 1 being the father are almost 5 times as much as the chances of man 2 being the father.
Please feel free to ask for further clarifications.
Patient replied :
Yes I am currently 11 weeks. The second man wore a condom from the time we started until finish he pulled out before he ejaculated and the condom never fell off or broke. I am just worried because I have had sex with man one before on the days that I thought I was fertile and never fell pregnant. I want this to be man ones baby and not man 2. Are non-invasive prenatal paternity test accurate?
The non invasive tests that use maternal blood are upto 99 % reliable in establishing paternity.
As man 2 had a condom on, plus did not ejaculate inside, the chances of pregnancy are quite low.
Also, everytime you have sex on fertile days, pregnancy is not a must.
So do not worry, the odds of man 1 being the father are quite high.
Please go for the paternity test to be quite sure.