May be they had a problem in your 2FP. Call the customer service and ask about this.
Me and my spouse got 3 FP notices each, for our first FP, within a span of 1 week, in Dec 2001, even before we gave our FP. So, we didnt have any problems. In your case, as there is a gap of one month, it may be that your FP was not taken properly or something. So, dont take a chance.
Good luck!