It would be best for you to check with your doctor or pharmacist.

The real concern here is that you have a need to take it again in less than two weeks. You didn't learn the first time? Are you having trouble deciding if you want to get pregnant right now? If you're going to have sex, and don't want a baby in 9 months, then use protection. The morning after pill is not protection. Regular birth control pills, the nuva ring, iuds, the shot, condoms-those are all forms of birth control.

The morning after pill... is it safe? Yes... is it GOOD for you? Not in the slightest. The morning after pill is a concoction FILLED with super concentrated hormones. It makes your body think it's pregnant, and thus, the egg will not be fertilized. Do you think it's good for your body to think it's pregnant twice in two weeks?

Yes, it's "relatively" safe to take, and I say relatively because many different people will have many different reactions to it... some good, some bad.

Like justcurious said, use a condom, use birth control pills, do something else, because your methods aren't working.