Brown blood generally means its old blood, perhaps from an old period such as the one before this.
Its usually nothing to worry about.
Periods can be irregular at times, its pretty natural.
But if your really worried and the problem persists contact your GP to settle any fears.
Menstrual cycle refers to your reproductive cycle, I think you mean menstruation or your period. Menstrual flow can be brown when your period is light, the blood takes time to leave the body so turns brown just like any other blood would as it gets old, and it mixes with discharge.
It's common for menstrual blood to change colors during your period. Red blood at the start of your period is fresh blood, while brown blood towards the end is older blood that takes longer to exit the body. This is a normal part of the menstrual cycle and usually not a cause for concern.
The brown blood is old blood your system is just cleaning itself out
It is not unusual for menstrual blood to be brown, especially at the beginning or end of menstruation. This is because menstrual fluid contains tissue and other substances besides blood.
The brown discharge that may come out during your period is usually old blood that has oxidized and is being expelled from the uterus along with the menstrual flow. This is normal and typically occurs at the beginning or end of your period.
The term menstrual cycle refers to your entire reproductive cycle, I think you mean menstruation or your period. Menstrual flow can be brown when it is light as it takes time for the blood to leave the body and it goes brown as it gets old, it also mixes with discharge which changes the colour too.
When you start your period if you have brown, old blood first you count those days as the first day of your 28 day menstrual cycle. You do not have to start counting day one when the blood is red.
This is normal, throughout your teens you can see a lot of irregularity in your menstrual cycles and in your menstrual flow patterns. Brown is just 'old blood' it's light bleeding that's taking time to leave your body as it's so light, thus turning brown before it gets out of your body. Nothing to worry about.
See the related link on what causes brown discharge after period.
Dark, brown menstruation may be a sign that it is 'old' blood. Sometimes blood stays in the uterus for a few days before your period 'starts'...it could be because it is a light flow or that the cervical opening is very narrow making it difficult for the blood to exit. Light flows and dark blood could also occur because of dehydration.
Brown dried blood in a wound or on a surface could be caused by the oxidation of hemoglobin in the blood, which occurs when blood is exposed to air for a period of time. This process can result in the blood turning brown in color. Other potential causes could include older blood that has been present for a longer period of time, or the presence of certain substances or conditions that can affect the color of the blood.
There are different types of period blood, including bright red, dark red, brown, and pink. Bright red blood usually indicates a fresh flow, while dark red or brown blood may be older blood. Pink blood can be a sign of light bleeding. Changes in period blood color or consistency can indicate various aspects of menstrual health, such as hormone levels, hydration, or potential health issues. It's important to pay attention to these changes and consult a healthcare provider if needed.