I have started menstruating and it has only been real blood once, all the other times it brown or dark brown for months. They are always light and last two days! (btw I'm 12 so... ) and I would get bloaty and fart a lot before my period then after the two days the period and pms stops. But this month the pms has been going on for days I keep farting and having lots of poop.. lol seriously and sometimes my chest would get a burning sensation when I touch it or breath. (Left and right) by the way breasts are developing. Please help I'm scared..