Hi Both
No-one can tell you for sure about KC and pregnancy because no-one knows for sure. As I replied on another thread - professionals can only give you definitive answers when there has been a proper study on the subject. The study simply has not been done. There was a big study on KC in the US several years ago - the CLEK study - but there were not enough pregnant women in the study to be able to draw any conclusions. Its also a difficult thing to do in a study. You would have to recruit a group of non pregnant females and ones who thought they were going to become pregnant or had just had a check up before they got pregnant, so that baseline information could be gathered on both. The two groups would have to be broadly similar in KC types and age of onset etc so that normal progression rates could be compared. There are actually so many variables here (contact lens types, length of time wearing contacts, etc etc) that it would be difficult to absolutely sure.
Gut feeling is that as KC tends to progress more when hormones are overly active (eg puberty) and slow down when not (menopause, ageing etc) that it may have an effect but my experience is that patients differ and you can't really generalise. Professor Zadnik who was involved with CLEK mentions it is a recent online article
http://optometrytimes.modernmedicine.com/optometrytimes/Modern+Medicine+Now/Keratoconus-counseling-insights-offered-with-the-C/ArticleStandard/Article/detail/627299?contextCategoryId=48141&ref=25Experience again shows me that many mothers, KC or not, simply give up wear of lenses when the baby is young, simply because its too much effort to put them in! On the other hand, if your RGPs drive you crazy, then try soft lenses for KC as, if they are prescribed in high water content materials, they can be worn comfortably for most of the day. if those don't suit, then semi sclerals or sclerals may help - there are many other lens types out there!
Genetics: I think personally there is plenty of evidence now to show that KC has genetic links but maybe is not the whole picture. I certainly have many patients who have siblings or children with KC and others who do not.
Good luck
Lynn