doubt in pregnancy month calculation

naan eppo 6 months pregnant, ennoda last periods date FEB-11,tamil matha padi thai-29,ennaku valaikapu 7th monthla vaikka amma ninaikuranga, anna tamil month calculation padi 7th month aadiya illa avaniyanu, doubta erukku, enakku due date nov-18 kuduthirkanga..please month calculate panna help pannunga..

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