So I swapped bjs with a guy about 3 months ago. No symptoms for 2 months. Slowly about 4 weeks ago my pelvic area, abdomen, lower back and groin began to ache. I didnt think std when I went to the doctor. Also no testicle pain, urination or ejaculatory pain, and no discharge. He ran blood tests and urine tests. Everything came back good, including no infections found, uti, liver function, no uti, no elevated white blood cells. Only thing was 3.8 psa count. Slightly high. The doctor thought it was a muscle ligament strain. It doesnt really feel like a strain. So with these symptoms starting 2 months after encounter, and my symptoms being what they are and no infection found with tests. Could it be an sti