Stopped taking Lo Loestrin Fe & now no period!

Brittany
I stopped taking Lo Loestrin Fe in August. My last period was August 20. It’s now December 15. So I’m going on 4 months with NO PERIOD. 
Every home pregnancy test I’ve taken is negative. (I’ve been taking them every week almost since I keep missing my period). 
I’ve always had light and irregular periods off birth control, so it’s not *that* unusual, but this is going on 4 months since my last period so I’m starting to freak out a bit. 
I’ve read that Lo Loestrin Fe will make your periods stop (but I’m guessing that’s only while you’re taking it, I’ve been off it since August!). 
I have had no other significant symptoms. 
Has this happened to anyone else? No period for 4 months and home pregnancy test negative?