Self employed - earning whilst getting mat allowance. UK

Hello, I wonder if anyone can help or is in a similar position. I am self employed sole trader and have my first baby due late October. My nature of my work means I work with a client but the. Might only get paid for this work a few months later. I plan to claim maternity allowance and then no set plan for returning to work yet. I may do the odd bit of work here and there depending on how it goes when the baby is here. I’ve been googling and from what I can see I am allowed to still work self employed and earn whilst I am on maternity allowance? Just wanted to see if anyone knew this is true. My worry is I don’t want to claim and then be asked for any of it back if they see I’ve had income whilst claiming it. Thanks for any help 😊