Strange cycles

I posted on here the other day regards my cycles I'm lost :(

I was on deposit injection for few years and last year round Xmas time we decided to stop and try for another baby. I never had a cycle for a good few months 1st cycle I had was 4th October which lasted 5 days. Second then as it should 1st November I was on for a week then off for a week. Then 14th November I had what was like a cycle again which lasted 5 dad again. I was due my third cycle 27th which has all gone accordingly but it's not like the other 2 cycles have been it's hardly anything at all what could be going on? Can anyone advise please? :(