My cycle has shortened drastically. It has dropped to 18 days! 3rd time in a row now.

I almost DIED when it was back again today.

There are two things that might be modifying things so wanted to get some feedback.

The first is I am still bfing Diva. The other is my DD1. Her period started when I was pregnant with Diva. I am told women in the same house tend to have their cycles sync. Hers just finished so could it be related?

Beginning of the year it was a steady 27-28 days. I can't do 18 days. Please tell me that this has every chance of going back to normal!