Weird "period" help

My period are irregular literally can be anywhere from the 5th to the 18th of each month, my flow usually is VERY HEAVY the first 1-3 days and then starts to get a bit lighter then the last day I spot brown. ANYWAYS this month my "period" started on the 17th and it was lighter than normal maybe only needed a pad for the whole day, the 18th it was already getting a lot lighter and no cramps at all, the 19th it was only spotting and only really was noticeable when I used the washroom, the 20th it was gone! Feb 22nd I noticed brown discharge and I still am having it today. No pain at all just feel really bloated and sleepy (I have been sexually active no protection)