Hello Michelle Atkinson,
It may be a scam; you should probably check with IDEA:
IDEA Health & Fitness Association
10190 Telesis Court
San Diego, CA 92121
Phone: (858) 535-8979, ext. 7
Toll-Free: (800) 999-4332, ext. 7
Fax: (619) 344-0380
Business Hours: Monday through Friday, 6:00am-5:00pm Pacific Standard Time
Natalie aka NAPS 2 B Fit.
You can e-mail them now to report it right away (even though they are not open), and then follow up by calling IDEA on Monday when the offices are open.
This happened to me a few weeks ago when I registered for the Vegas conference. The system somehow double booked my conference fee–and it was removed from my credit card quickly. Not sure why it happened, but it was corrected.