My 2 Cents
Wow, you’ve got serious balls going back to the gym and sex within two days.
But to OP, I think the dates say you got it done already, so just in my opinion, don’t rush it. I laid off all stretching for about a month after the surgery and had no problems.
I wasn’t pumping at the time, but given the scrotum skin that is taking a lot of the suction while pumping is very close to the incision, I would be careful of pulling it back open. (Regardless how small and harmless that cut looks, it was still on my balls).
And stretching involves pulling directly on the tube that was clipped, so yeah I was super conservative and waited the entire week before sex, and even masturbated before then just to make sure I wasn’t going to full on hurt myself during. (That first one was crazy and worth waiting if you’re otherwise as frequent as I am)
In any case, follow-up with any experiences if you push the envelope, these things scare more people than they necessarily have to.