It works the other way as well. Years ago, a girl swore that I got her pregnant. I told her that I wasn't going to marry her and (selfishly) left it up to her to deal with it. Years later her daughter (from that pregnancy) contacted me and wanted to begin a relationship as my long-lost daughter. However, when Ancestry.com was 'brought into it' there was no genetic connection between me and her, and I haven't heard from her since. I was suspicious from the start that someone else had gotten the woman pregnant but she wanted me.
Not the first time this has happened to me. A girl I was involved with got mad at me and broke up with me. She then went and had 'revenge sex' with some guy and got knocked up. Then she came back to me wanting to get married. I didn't fall for it, and she went back and married the guy. I heard later from her brother-in-law that she and the guy were miserable in their marriage. Serves her right.