Under the Hindu Marriage Act, 1955, for the pregnancy ground, a petition is maintainable only if:

Section 12(2)(b) requires the court to be satisfied that the petitioner "was at the time of the marriage ignorant of the facts alleged", that proceedings for a post-Act marriage were instituted within one year from the date of the marriage, and that "marital intercourse with the consent of the petitioner has not taken place since the discovery". The period runs from the marriage, not from discovery.