Hi! I'm starting to have to use hair bobbles to fasten my jeans, so I'm gonna take the plunge into maternity wear. Do I buy my normal size or do I go a couple of sizes up? So do I buy size 8 maternity or go for a 10/12? It's my first baby (bet you hadn't guessed) so I have no idea! Thanks so much, and sorry for a question that probably gets asked a lot!