Pain after traction exercise

Hello guys, I'm doing traction as my urologist specified

He told me to do 20 mins of manual traction 2 times a day. He didn't explain much detail about how to do it.

When I finish the 20 min session and I go to bed right after, I feel pain somewhere close to the pubic area. Not in the penis itself, something more internal in there.

I used to do traction whille sitting but I changed it to standing because I thought that was the issue. It was not. It still hurts. The pain doesn't last more than an hour after the exercise. And it's not extremely painful but it's still worrying. I try to not apply too much force. But maybe even what I'm doing is too much

Anyone had this experience? Am I pulling too hard or what could be causing this? Thanks