I don't have any sick leave time, is it safe to return to work after getting surgery on testicle? or should i rest? i push buggies at a food market.

Unclear: Best to not lift anything heavy for 3-4 weeks after the surgery (while healing) but depends on type of surgery; you should ask your surgeon.

Surgery: Not knowing the type of surgery is hard to determine how long you should be out of work. The usual recommendation is that if you still have pain and swelling requiring medication you should rest and follow the advice of your surgeon.