Oh! dear, sorry to read this, but most of us have had that sort of thing happen. Hard to explain how a few bits of gravel on an otherwise smooth surface can bring us down, but it does.
If the bike feels and runs as it normally does then you're unlikely to have a problem.
It is possible that the white exhaust emission is normal, for a cold start, this time of year, but that now you have good cause to stand back and look at it.