Weight loss

So, long story short, I gained like 90-100 pounds in a years time... I got up to 233... I was 233 last check in mid March. Fast forward to today, I’m down to 202! Crazy thing is, I wasn’t even fully trying to lose weight. Doctors haven’t really said anything about it, but I went from 233 mid March to 208 by the end of April. I’m thinking it’s because I was so sick. (I had viral pneumonia and couldn’t eat anything hardly, still can’t..) I guess my question is... should I be concerned about losing weight like that? (I mean that’s almost 20 pounds in a month right?) I mean it’s tapered off, I’ve slowed it down.