No, I wouldnt say it was normal, but when did you place your order? If it was someitme ago, the usual sequence is you get confirmation around December - request for payment around January/February (they take the money from your credit card soon after you give them details) - tickets in May.
I would recommend you telephone them asap - they speak english so dont worry about that!
If they have lost your order and you have no tickets I think Paddy_NL has some spare Bleu Nord tickets still - see the "Tickets for sale" thread.
Good luck!
Fran