My period is coming at different times each month, for example on February 28th then March 15th then April 4th, is this normal?

Adriana, you might check out this link from WebMD. If you are a young girl, having an irregular cycle is not that unusual. My advice - keep tracking this and always have something on you, just in case.

http://www.webmd.com/women/tc/missed-or-irregular-periods-topic-overview