Can PRP treatment for hair loss still be effective even if I have hsv-2?

This should not have an effect.  The research performed and the anecdotal evidence would suggest that
thickness of hair and density can improve with PRP injections.  The
number of sessions as well as the quality of PRP obtained will vary
considerably physician to physician.

Your genital herpes should not affect your PRP hair treatment, if anything it should help you.

in my opinion, genital herpes is not a contraindication for the use of PRP for androgenic Alopecia. There should be no interaction between the two.  find a PRP expert. Ask to see photos.PRPHAIRMD.COM 

Hello Selfmade00,
There is not interaction between the Herpes and PRP. This is your second month doing PRP, give it some time to work, also Androgenic alopecia can be caused by a variety of factors.
PRP  has shown to increase the caliber of the miniaturized hairs which creates a fuller look. You may want to get full assessment and possibly add other treatments. 
 I would recommend voicing your concerns to the physician treating you.

Having genital herpes should not affect the efficacy of your PRP treatments for hair loss.I hope this answer is helpful! Best of luck.