Yes, they can.
periods could happen twice in one month, but the next month, you might miss
You will probably have one next month. It sounds like you are having irregular periods. Going on the birth-control pill can often help sort this out and make your periods more regualr.
24 Semi-Monthly means twice per month. 12 months in a year times twice a month = 24
Some girls do get there period twice a month like at the begin of the month and at the end of it. If you are having two periods close together that's something that you should go get checked out at the doctors.
How old are you? If you are still young and just having your first periods, it probably means your body hasn't gotten into a natural cycle yet.
First of all periods last 5-7 days not 30...you do not have two periods in one month STUPID!!
While you are pregnant you do not have periods at all.
When you get your period depends on your menstrual cycle. If you have a 28 day menstrual cycle you will likely get your period once per month, where as if you have a 20 day cycle it is possible to have two periods in one month - e.g. you could get your epriod on the 1st of the month, then again on the 20th of the month.
These may be perfectly normal. You are not a machine and something occur out of order.
You probally just have eregular periods its ok.
It isn't that abnormal to have two periods in a month. However, sometimes it can occur, if you have a short cycle and your period starts at the beginning of the month. This would make it possible to have two periods in one month.
Twice a month means that something happens two times in one month, usually on a regular schedule.