We can't really tell you. I think you need to be more careful with your body. If your period is late, you should be able to take a prgnancy test and get an accureate result.

A lot of things can effect your period. It could be stress, pregnancy, or a bunch of other things. You'll just have to keep an eye on it, maybe take a pregnancy test, see an ob-gyn if it continues, and start taking care of yourself.

i would say the most likely culprit for your late period would be the unprotected sex... if you had unprotected sex then it is likely you are pregnant. though, it is also possible that the stress of your new job and not sleeping could confuse your cycle. i would say ecstacy is unlikely to have much to do with it. me and my friends take it and it doesn't affect our periods. but having said that different things affect different people in different ways!

i'd advise you to take a pregnancy test. it's the only way you will know.

all the best