ok, sometimes i get worried because my period doesn't come for about 5 days after the 28th day of the month...

Answer 1

If it happens more then once, then you just have irregular periods. I know I do sometimes, and I sometimes go a few weeks over before I get mine. You may want to see a doc to make sure everything is ok, but it sounds to me, like you are fine. Everybody is different.

Answer 2

It's all normal. Just watch for any irregularities like, heavy bleeding and cramping. If so, then there's a need to worry and get it checked out.