Websites for Facts:
Abstract of “Blood volume changes in normal pregnancy” on PubMed - http://www.ncbi.nlm.nih.gov/pubmed/4075604
“What Bodily Changes can You Expect during Pregnancy” on Healthline – http://www.healthline.com/health/pregnancy/bodily-changes-during#PhysiologicalChanges2
“Did You Know” on Welcome Home Baby – http://www.welcomebabyhome.com/pregnancy/did_you_know_pregnancy.htm
“21 Amazing Facts about Your Pregnant Body” on Babyexpert - http://www.babyexpert.com/pregnancy/second-trimester/21-amazing-facts-about-your-pregnant-body/1037.html
Doula Rachel has put together a blog of resources, info-graphics, and articles, with an occasional self-published blog. Enjoy!