Congrats! Per
AAMC's traffic rules (really, it only takes a moment to google this):
6. After April 30, implement school-specific procedures for accepted applicants who, without adequate explanation, continue to hold one or more places at other schools or programs.
a. Each school or program should permit applicants:
1. A minimum of five business days to respond to an acceptance offer. This may be reduced to a minimum of two business days within 30 days of the start of orientation.
2. Submit a statement of intent, a deposit, or both.
b. Recognize the challenges of applicants with multiple acceptance offers, applicants who have not yet received an acceptance offer, and applicants who have not yet been informed about financial aid opportunities at schools to which they have been accepted.
c. Permit applicants who have been accepted or who have been granted a deferral, to remain on other schools' or programs' wait lists. Also, permit these applicants to withdraw if they later receive an acceptance offer from a preferred school or program.
7. Each school's pre-enrollment deposit should not exceed $100 and (except for EDP applicants,) be refundable until April 30. If the applicant enrolls at the school, the school should credit the deposit toward tuition. Schools should not require additional deposits or matriculation fees prior to matriculation.
You will have to withdraw from one of the schools, obviously, but it appears that you have a minimum of 5 days to sit on both offers before making a decision. If you're planning on thinking over the decision, it would be a good idea to let the first school know so that there aren't any miscommunications (they will be able to see that you're accepted to another school, I believe). It appears that the deposit is only required to be refundable through April 30th, though you can check with the first school to see.
