My periods late, but I'm not pregnant.?

There are a number of things that could be making your period late. Even if the condom didn't break, it could still have a tiny hole that the sperm could seep through, making you pregnant. That is very unlikely, but it is still a possibility. If you took the pregnancy test and it came up negative, then most likely you aren't pregnant. Those tests are really accurate. Stress could be causing an abnormal period, which is probably the most common reason. I would wait another day or two and take another pregnancy test. If it still comes up negative, I would call your doctor. If you're not on birth control, you usually don't just skip periods. (At least I never did)