I think got my period for the first time but am not sure because whatever is in underwear really dark brown when go to bathroom and wipe all bloody so this period?

It is possible that you have gotten your period for the first time, but it's also important to consider other factors to be certain. Here are some things to keep in mind:

Spotting vs. period: During the first few menstrual cycles, it's common to experience spotting or light bleeding before the actual period begins. This can be a sign that your body is preparing for menstruation.

Color of period blood: The color of period blood can vary. It can be bright red, dark red, or even brownish. Darker blood is usually older blood that has been in the uterus for a longer time before being shed.

Duration of bleeding: A typical period lasts for around 3-7 days, but it can vary from person to person. If you're experiencing heavy bleeding or spotting for an extended period of time, it's best to consult with a healthcare professional.

Other symptoms: In addition to bleeding, you may experience other symptoms during your period, such as cramps, bloating, mood swings, or headaches. These symptoms can help you recognize when your period is starting.

If you're still unsure whether you've gotten your period, it's a good idea to consult with a healthcare professional, such as a gynecologist or family doctor. They can provide guidance, answer any questions you have, and rule out any other potential causes for the bleeding.