Couldn’t find an answer to this on google so thought I’d ask Mumsnet! Out of curiosity- how do you work out your due date if you conceive on the pill and don’t have periods? As in if you miss a pill one day or take it late and get pregnant but don’t realise ( I know this is unlikely but can happen). I had a ‘scare’ the other day and was wondering this. Do they have to do it from scans?