Rhyviney

As the title suggests, does the income need to be reported via self assessment if the income is less than £12570? Currently I am a stay at home wife looking after my 3 kids (husband works full time) and this is an additional income stream we are looking at and trying to utilise my personal tax allowance of £12570 which is basically sitting idle for the last 3 years or so. Any replies is highly appreciated. Thanks.