since u are taking 19 credits u can easily drop that course and not be out of status...because the minimum requirement for undergrads is just 12 credits i think. and if the last day to drop has already passed by......you can always go talk to your adviser or somebody and with their permission you can get a W instead of a F. but dont be scared to go talk to your adviser and the international office.....specially since you are doing pretty good on other courses. good luck!