‘And as the morning began the angels put pressure on Lot to hurry up, saying, “Get up. Take your wife and your two daughters who are here, lest you be consumed in the punishment on the iniquity of the city.'
As first light arises the matter is now urgent and there is no time to lose. ‘Who are here' suggests he may well have had further daughters. On the other hand Genesis 19:31 calls one of them ‘the firstborn'.