Black spot in vision getting larger

I've been seeing black spots in my right eye since last year (and now even in my left eye) and have gotten used to them. Also went to an opthamologist because of this, and she thought the spot as a floater.

The dot NEVER moves when I look round. It's always in the middle of my vision and shows up when I blink.
(I can't see it in the dark, even though I think it's still there...)
It doesn't float like other floaters (I have floaters) and usually before it starts going away, it becomes bigger. About 2,2mm.

Now the question is; is this really a floater, even though it doesn't float when I move my eyes around? Is it normal for a floater to get bigger and then vanish? Could this have something to do with hormonal changes? (The black dot is basicly a black dot with a light ring around it.)

(Im 20yrs old)