Verified answer

No, it's perfectly normal; especially if you're still young and your period is still working itself out. Every once in a while, though, you still get a random little blip in your cycle where you might be really late or really early.

It depends. If this is your first year having a period, then it's normal because your body is regulating itself. If you just started birth control this month, its normal while your body hormones balance out. If you are underweight, it is normal because those who are underweight do not have properly working hormones. Check with your doctor if it is really bothering you, but as long as it normals out in the next month or two, you should be fine.