Hi RubyJ, so glad you found the group here
It makes sense that you know you need help but aren't sure of the first steps to take, especially when your daughter has out of the blue cut you off. Add the stress and worry you must be feeling about her pregnancy, and anyone would feel overwhelmed.
What seems positive, in an odd way, is that you've realized this:
no contact is difficult but i know it is best for now until I learn how to communicate with her.
Despite the pain of her not being in touch with you, you have been able to see that as a bit of a respite, where you can take a break from the intensity, and have space to learn new and different ways of communication for down the road.
This is a good place to start learning about other parents' experiences -- what worked, what didn't -- and to check out some resources we have, like our section of
articles about when your child has BPD. You can start there and see how it feels for you

...
Are you in a relationship right now (with your daughter's father, stepdad, other)? If so, is your partner supportive of you/understanding of the situation?
Keep us in the loop -- we'll be here for you.
kells76