I'd go to the doctor. I played baseball for a lot of years growing up and took more than my share of nut shots.... Pretty much all were nothing and there were no changes. One time there was a change in the way one felt. Turned out, somehow, the testicle twisted itself inside the sack and was cutting off blood flow to it. I believe it was diagnosed as "torsion testicle".
It's your nuts man. If there's a lump, go get it looked at.
Hi, first I would give it more time to let things get really back to normal, all the bruising gone and any swelling gone as well, if this small pea sized lump is there, get to your doctor, he should sort you out,
Good Luck