has anyone had to get a cab to therapy and if so, can you go in early if it's raining hard?

I normally get a lift to my sessions but tomorrow I'll have to get a cab and the forecast is torrential rain I see my T privately so there's no waiting area. It wouldn't have been a problem when seeing my agency T but I really don't know if my current T will be happy with me turning up early. I want to book the cab with enough time so I don't end up missing some of the session but of course this means I might get there early.

I was wondering whether to ring T tomorrow if it's raining heavily and ask her what i could do?

I don't have an umbrella and health difficulties mean it is difficult for me to stand in the street for very long.

This probably sounds crazy but I'm worried about it.