Is my Apple Watch 5 water proof can I swim wit it

Apple Watch 5 is water-resistant up to 50 meters, it was designed with swimmers in mind so as long as you keep it to 50 meters or under you should be fine but remember to be careful as obviously dropping it could cause difficulty.

REMEMBER - Water Resistant does not mean Water Proof.

You might also find this helpful:

Water resistant to 50 metres, Apple Watch Series 5 is designed with swimmers in mind.1 The Pool Swim workout automatically records splits and sets and can even recognise your stroke. The Open Water Swim workout visualises your route on a map. And both precisely track active calories, distance and overall pace.

Source and More Info Apple Watch Series 5 - Workout - Apple (UK)

https://www.apple.com/apple-watch-series-5/

It says, "water resistance to 50 meters". This watch is also made with swimmers in mind so I think you should be fine :)