Thats not healthy. 1750 or 1800 is healthy. Eat blackberies or blueberries. They help burn fat. Green tea as well. Another tip? Eat the most cal in the morning. Youll burn it off. Might i also add drink mainly only water?
Have you tried the simple thing of eating more and seeing if this resolves the issue?
When i was on a deficit calori diet to lose weight i experienced this, but not two months, my period took sometimes a week or sometimes 10 days .. But never two months, if am not wrong your calori deficit affects the production of hormones mainly oestrogen, and since we don't have the same hormon profile maybe your "late state" happens for two months and mine weeks, i don't know..
But you should really go see a doctor
Many friends of mine without having a cal deficit have their periods once in two months or once in three months, even if this never happened to you and it just did after eating less, i suggest to go see a doc it's better and more assuring .