As a nurse, it is usual in most of the US. States that up to 20 weeks is considered for termination of pregnancy ( TOP).What is meant by ” too late” for termination? If she is over 20 weeks, TOP is usually not an option. So, she could be up to 5 months pregnant. Highly unlikely she “just” found out. She need to talk with the father. What will probably happen, is he will deny paternity, if she has a history of hopping around. It may take paternity tests to declare the father.  The father that is being accused, could do the tests and be off the hook.  Any possibility that others are potential fathers, from the time of her “one night stand”, to the time you started dating her?   Are there others she approached with this same scenario? Looking to find someone to support her? How did you reconnect? Did she reach out to you , or you to her?  Your story sounds so familiar, as I have seen several unsuspecting and naive men get taken for a ride. It ended up ugly for all involved, when the truth came out years later.