Ok thank you. I thought so but wanted to be for sure.
How is my conception date November 25th?
When you got your first ultrasound, how many weeks GA were you? Did they give you the due date of November 18 then? If you got your first ultrasound later than your 10th week, the margin for error is going to be too wide to be able to use ultrasound evidence to try to pinpoint conception because the men were so close together in time.
Even if your due date came from a 6th or 7th week ultrasound, unfortunately, sperm from February 21 could have been alive in your reproductive tract until February 26 or 27. This would mean that on February 24, you would have had living sperm from both men in your system at the same time. At which point, if you ovulated, it is just luck of the draw which man could be the father.
You could try to guess using the biological theory behind the Shettles method. In this theory, if the sperm that produced the child is a few days old, the child is likelier to be a girl, meaning in this case Man 1 would have a (slightly) higher chance of being the dad, and if the sperm that produced the child is newer, the child is likelier to be a boy, meaning Man 2 would have a slightly higher chance. However, the Shettles method is not proven.
All you can do is a DNA test, either now or once the baby is born. If you do a prenatal test, try Ravgen or the DDC, don't go with an Internet cheapie or you'll just waste your money.