Where's my period and what do I do?

I haven't had my period in a month..and I don't know what to do...? I need advise on what it could mean or what I could do...

and I am a girl...

ok, the first and most obvious is are you sexually active?

if you are then have you thought about doing a pregnancy test?
also, if you are when was the last time you had a period? when was the last time you had intercourse?

if not, then theres a whole lotta reasons;
1)are you eating properly? have you lost weight recently?
2) are you getting any other symptoms of anything?
3) stressing about the lack of periods can actually delay you having one.
4) were your periods reliable before? as in every 28 days? lasting about 3-5 days (please note, this is an average for women, and all women are different, some people only have periods for a day or two, some for a whole week)
5) how old are you?
6)have you had an injury lately (sports etc)

need more info hunny, but don't freak out!

calm down dont worry. if you just startd than they are most likely going to be irregular if not I agree with the one above my answer! lol [sooitca]

calm down... I checked on your profile and your around 13...right? so if you're not sexually active, then it's most likly that your cycle is still irregular like volleeit has said!! as your body matures, so will your cycle =)

13 (get you butterfly kiss3z being all clever and checking her profile lol!)

yeah, I had huge gaps in mine when I started, and when they did come, they were half hearted efforts, spotting or lasting a day was quite normal! but I was about 11 I think. but as I said before, every women is different, I had friends start at 9 (for gods sake!) and as late as 18...

sooitca was very helpful
if your sexualy active you could be pregnant
if youve lost weight recently your body could be a bit damadged
and not be able to make your period work, especially if you have an eating diesorder or take drastic action towards loosing weight...like over-exerscising and not eating
also stress can hold off your period
and if they arnt regular, you could have skipped one
if thats the case it should return like normal the next month

I wouldn't worry I had my first period when I was 13 and then didn't have another one for 18 months, that was when my doctor decided to put me on the pill, my periods came. However I don't know what they will be like as soon as I come off them next year and I'm only 17. Go to your doctor.