Is it ok to take ecstasy two days in a row?

No. The second day the ecstasy will probably have almost no effect on you, because there are almost no serotonin left in your brain. You need to let yourself some time to rebuild them, take care of yourself and eat healthy before you can do it again. You could be ok if you take it one week later, but the best is to wait at least two weeks before doing it again.