Hi Mum2Ramone - I used First Response, but they can be expensive - especially if you really like to POAS early! I bought some online from LullabyConceptions and they were really great and also cheap. I definately think that First Response give an earlier indicator, but I used the Lullaby ones to see if I thought there was a line and then if I thought I could see one, I would use a first response. I bought the YES/NO digital ones too but they are so expensive I only used one and there is still one sitting in my drawer unused!!