My friend had a miscarriage, what do i talk to her about? How can i help her?

She told me about her miscarriage at 9 weeks on the phone about a week ago and i was devastated for her but i didn't know how and what to say cause I'm 5 months along with my second baby and I felt like she needs time to grieve and that I shouldn't be to clings with her at this time cause she might feel more horrible talking to a pregnant women =/ I'm clueless. I have told her that I'm there for her if she needs me. How much time should i give her to grieve before I call back? Is a week to long to not call her? Please help?