I'm not here to advise you what to do.
But I think that 19 months is a MASSIVE achievement. I only BF for a week, but expressed for 7 weeks while DD was in hospital.
I would have given anything to do a few months. You should be so proud of yourself for feeding for 19 amazing months.
You've given your DD the best start in life and you deserve some praise.
I completely understand why you want to wean and if I was high risk again (and if I was still bf-ing) I would wean.

Good luck with your decision.