“What are some common signs of pregnancy?”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (12 July 2013). 19 March 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。
“Pregnancy: Condition Information”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (19 December 2013). 19 March 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。
“How do I know if I'm pregnant?”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (30 November 2012). 2 April 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。
“What are some common signs of pregnancy?”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (12 July 2013). 19 March 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。
“Pregnancy: Condition Information”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (19 December 2013). 19 March 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。
“How do I know if I'm pregnant?”. Eunice Kennedy Shriver National Institute of Child Health and Human Development (30 November 2012). 2 April 2015時点のオリジナルよりアーカイブ。14 March 2015閲覧。