Following up on this post, R. Chaim Jachter has an Op-Ed in this week's The Jewish Press on this topic, based on his chapter in Gray Matter volume 2 (link):
A proposal for changing the laws of taharat hamishpachah (family purity) was recently raised in the Israeli newspaper HaTzofeh, based on the observation that adherence to these laws may be responsible for many couples experiencing difficulty conceiving. Healthcare professionals have named this phenomenon “Orthodox Infertility.”Read the rest here.
For some women, the time they wait before immersing in a mikvah each month likely prevents them from being able to conceive. It is halacha that is causing this infertility and, absent these laws, the couple would be able to have a child. Understandably, this problem can cause significant anguish to those who suffer from it – anguish that may make us wish we could alter the rules and allow these suffering souls, for whom we must have much sympathy, to conceive children.
This, however, is not possible...