I'm just looking for advice please...

we sorted ESTA's last year in september everything was fine, now i have had 3 emails telling me its running out.... they last for 2 years... i have already sorted it for our forthcoming trip in 3 weeks 4 days () they are the real thing that is sent through to me and when i have gone on the GOV/passport/esta website and have printed the Estas out already to go and they dont expire until september 18th 2015

should i worry?