Mine is just./guessing...

Hey hun, It's honestly different with every girl. I know for the first few years of having mine t was exactly that, guessing! Only in the last 2 years has mine been predictable. But here are some symptoms of PMS (Pre-Menstrual Syndrome, which are things that happen to your body before the start of your periods).

PMS often includes both physical and emotional symptoms. Common symptoms are:

* acne
* breast swelling and tenderness
* feeling tired
* having trouble sleeping
* upset stomach, bloating, constipation, or diarrhea
* headache or backache
* appetite changes or food cravings
* joint or muscle pain
* trouble concentrating or remembering
* tension, irritability, mood swings, or crying spells

* anxiety or depression

Symptoms vary from one woman to another. If you think you have PMS, keep track of which symptoms you have and how severe they are for a few months. You can use a calendar to write down the symptoms you have each day or you can use a form to track your symptoms. That way you can tell for yourself if you are about to start your period.

I hope this helps.