She should tell him this at least, also something is fishy the organizator of the dance competition told Indira that her husband gave a report saying that she is pregnant and she cant take part in the competition and Indira didnt say anything about it to Rishy yet...After knowing that, Indira must explain to Rishy at least that she is not pregnant but Mandira is.
Indira should explain to Rishy that she can take part in the competition as she is not pregnant, it will make Rishy realise that she didnt take any risk for Chikou as he is not present yet.