Have a go at this.
Drink a decent amount of water (2 large cups) and wait for 30 minutes and get ready to get to the loo.
As soon as you feel anything, then start to pee standing up.
Once started, then try and stop the flow - this might take a few tries.
As soon as you can stop it, try and work out what muscles you are using.
Now when sitting down, try and exercise those same muscles by tensing then for 5 seconds and then relaxing for 10 seconds
Repeat this several times.
Do this 2-3 times a day (not the peeing bit but the tense/relax)
There are also some apps that you can use to try and do the same exercises (Squeezy) and if you get really stuck then you can see if perineal physiotherapy is available. That's a probe inserted into the rectum than uses electrical signals to stimulate the muscles, often used post-childbirth by women to recover bladder control.
But, it's still early days for sure