(I’m not sure where this reply will end up; I’m hoping below your message of May 27.)
What’s your thesis topic? The biography/novel idea sounds great. Good to make maximum use of all that research!
I’ve published articles and a book on childbirth-related themes (ages ago) but, like you, creative writing is a new direction. Having said that, I find that the discipline and skills of factual and academic writing (I did a masters in medical education) very helpful – including detailed planning.