Responsa for Niddah 31:44

צריכה ב' עדים על כל תשמיש ותשמיש או תשמש לאור הנר

ruled, Let her be examined.<span class="x" onmousemove="('comment',' Even though her period of menstruation had passed. If on examination she finds herself to be clean she is regarded as clean (despite the possibility of an earlier discharge) and if she finds herself unclean, the uncleanness is retrospective from the time her settled period was due. ');">³⁵</span>

Teshuvot Maharam