UPDATE: Celina aged up to a young adult. Damian is still a teenager (he'll be a young adult in one day). Marlon also became a young adult. Celina continued dating Marlon, and found out she was pregnant with his child. She was excited and told him. However, Marlon did not react as she expected. As it turns out, Marlon HATES children. That's a deal breaker for Celina, since she's a family-orientated sim. Her mother abandoned her when she was little, so she's always wanted to be the mother her mother never was (she tried to be part of her life, but ultimately fell short). She dumped Marlon on the spot.
Now, the big question: Will Damian step up to be the father of a child that's not his, or will Celina be a single mom? Her father and stepmother are fortunately willing to support her.