Nappies

Katie • 23 from UK. Single mum to Mya. Born 4th Feb 2017 👶🏼💗
May sound like a silly question but I haven't a clue. I'm only 7 weeks pregnant but I'm starting to buy for baby now. Realistically how many nappies should I buy in advance for baby's arrival?  Should I stock for a few weeks or months worth? Haven't the first clue lol.