Injured testicle from oral

So on Saturday some guy was going down on me and ended up sucking my left testicle pretty hard, which caused a significant amount of pain (not unbearable through, I was able to finish). Since then, I've been experiencing an aching pain on the left side. Again, I can function, but it's irritating and sometimes becomes a little overwhelming. I don't notice any swelling...should I go to the doctor? I feel like it may be a little bruised and with time should sort itself out. Anyone else experience something similar to this?