Is there such a thing as a doula that can be hired for support just for pregnancy and not attend the birth?

My friend is having a high risk pregnancy and anticipates she'll have a C-section. She asked me about having a doula. My initial response was that she had no need. But I found my doula very helpful and calming in 3rd trimester (when I was sent for growth scans, low weight gain, etc). My friend doesn't have a lot of family and might benefit from some extra support pre- and post- baby. I know there are post partum doulas. Has anyone seen doula services like that pre-labor?