Pineapples

I've read that pineapples can help you deal with your period better, but I didn't understand how. So on the first day of my cycle this month I ate a can of pineapples before I went to bed to see if it would change anything and when I woke up, I noticed that there was a LOT of blood flow over night. Does it increase the flow or something? And will this shorten the length of my period? Has anyone else tried this?