When does my employer coverage actually end? - 4 months and counting

I was told my coverage ends on my last day, but the letter says the end of the month. I would rather hear the honest version than the polite one. I have an appointment next week. Did coverage match what HR said?

Thanks for writing this out. I went through something close to it 4 months ago, and it got easier once I kept a simple log of every call and form.