Do I Need a Blood Test? Where do I draw the line?

Hi and thank you in advance for any attention you give this,
A month ago, I had unprotected sex with a friend.  Five days later, I experienced burning during urination.  My friend told me that she too had been experiencing maladies including a weird feeling in her urethra, general vaginal discomfort, and she had a sore on the outside of her vagina, which was swabbed for a herpes test.  I was treated by a urologist with Azithromycin, and in about a week, although a lymph node in my groin (left) had swelled a bit, my urination returned to normal.

However, my friend's test came back positive for HSV-2.  This upset me, so I went to my GP, who did a Igg test.  (This was exactly 3 weeks after the encounter.)   My test came back negative for both HSV 1 and HSV 2, but I have read only 50 percent of positive HSV 2 people would show antibodies by then.

My doctor and the urologist seemed to think that absent lesions, my urnine/lymph issue was not likely herpes.  They don't seem to think I need another blood test in a month or so.  But over the weekend (this would now be a full month post-exposure) I had a little pimple on my penis (near the tip) that made me think I definitely should be tested again.  To be honest, the pimple acted like a pimple, it's almost gone two days later, but it seemed unusual.  It makes me think I should test again in a month or so.  On the other hand, if this wasn't a friend who told me explicitly she had herpes, I never would have thought of herpes...what should I do?

What would you advise?

Thanks so much,
nycman