Should I try and be friends with my boyfriend's ex if...?

[neko]

Well this ex of his and me used to be friends. Not close friends, but we'd talk on facebook and in person when she was at the mall where I used to work. I just found out this week I am 3 weeks pregnant. My boyfriend's ex had a daughter with my boyfriend who is now two and will be three by the time his and my child is born. I'd really like it if my child could have a good relationship with his/her big half sister. Reason hers and my friendship ended was because she flipped out when she found out him and I were together, even though she and him broke up nearly two years ago and she left him for his now ex best friend. She also said I had to break up with him because she had him first (which in a sense isn't true because him and I dated back in 9th grade but broke up because he moved) and he didn't even know her until a few months after he moved to his new school.
So..what do you think?

[Dr. Soon Mom Koon]

You've made your bed; this woman is now a part of your life whether your like it or not, so you may as well be civil.

[Mimi]

No

[Blue Planet]

It sounds like all of you need to learn about birth control. Family-planning is a wonderful company you can get free birth control, condoms, all good information there And free. Regardless of how the mothers and fathers feel you're all showing your age by using the children as pawns in a game. Always think of the children first they are your most precious asset. Before either of both females have more children I highly suggest you look into birth control