Yeah, don’t get your expectations too high.
I had a similar situation. My parents got divorced when I was 6 years old. I lived with my father, since my mother had no interest in me (she was 19 when I was born, and it seems that she didn’t know that having a baby is a lot of work).I Had a rough time then, living with my father, his sister and her husband, abused by my cousin, then living with foster parents for two years (that was a great, finally a family that treated me well). During that time I had contact with my mother, but I can’t remember how often. Then my dad got married again and we moved together to a new home. I never had contact with my mother until I was 19 or 20. Then one day she wrote a letter. I carried it around for about 2 weeks before I finally read it. It took me another two weeks to write an answer. After a hesitant start we called each other every week. I visited her twice in that time, one time we went out for lunch with her mother. All I remember is that my grandmother was all teared up when she saw me. I really can’t remember how I felt about that meeting. I tend to suppress stuff like that. A couple of months later my grandmother died. I didn’t know what to say to my mother, other than “I’m sorry”. I never built a relationship with that woman, so I never saw her as my grandmother.
My mother married her boyfriend and told me afterwards. I felt conflicted. It was okay for me that she got married, but I would liked to have known before she actually did it. Anyway, she called one day and told me she’d be on a vacation for a couple of weeks and would call when she’s back. That was about 15 years ago. Still no phone call.
I think she only contacted me to do her mother a favor. She had no real interest in me. And after all these years I really lost all interest in her.

I really, really hope that you will make a better experience than I did.