crazy cycles for a year now.

I have been off birth control for exactly a year. my cycles are still not regular. sometimes they are about 40 days. they seem to slowly be going down, for awhile they were about 38ish days down to 35ish days then I hit 31 days. and now all the sudden I went from 31 days to 20 days. but the 20 day cycle was nothing but 5 days worth of really light spotting. then 20 days after that it was a real solid period. so I'm not sure if that first 20 day cycle was even a period. Now once again at 20 days, I had a sudden flow of pink/brown that almost filled a pad in one go then nothing else that day. the next day it was a small flow of brownish water that didn't even fill a panty liner. and nothing since then. any insight on this? I'm so confused as to what is going on. I always got pregnant the first month off bc whenever we were trying to conceive before but this time, I can't figure out when I'm ovulating cuz my cycles are so out of whack.