My dad's first wife told him that it must be HIM that was sterile, so they adopted a daughter. A few years later they got divorced. Then my parents started dating. Well, they got married Feb. 13 and I was born Sept. 18... I guess he wasn't sterile after all!
I think that your child's father is the man you had sex with is the first man. I think that the bleeding was implantation bleeding.
What you don't mention is when was your period before the Oct.27 one? Are you normally regular? Did you notice any signs of ovulation that month?
Also, with a one year old do you notice that she looks like one of the two men more than the other?
Get a paternity test. Even the walk-in clinics in my area are advertising them on their signs. I think they cost about $300-400.