I got a message from a woman with an inner labia piercing:

I just recently pierced my labia minora and I have been cleansing it with saline solution three times a day. It burns like crazy when I go to the bathroom though. I don't know if that can infect it or what I need to do to prevent infection. Please help. Thanks.

Photo of a woman with a VCH (Vertical Clitoral Hood)
and inner labia (labia minora) piercings

This is an excerpt from my book, The Piercing Bible--The Definitive Guide to Safe Body Piercing, and I think it could help you:

Genital Piercing: Urinating
Bodily fluids are apt to get on certain genital piercings, which is not a problem—if they are your own. Urine is one of man’s first antiseptics and, if you are healthy, your own liquid waste will not harm your piercing. The regular passage of urine over the jewelry helps to minimize crusting, too. Urine can sting during the first few days of healing, so drink lots of water. This dilutes the urine and lowers the acidity, which minimizes discomfort. Cranberry juice or large quantities of orange juice or vitamin C will make your urine acidic, which may cause excess discomfort. Additionally, you can pour a clean cup of water—warm or cool, as you prefer—over the area as you urinate. This rinses off the urine so it doesn’t linger uncomfortably, and the water feels soothing.

My piercing care information is here. It would be a good idea for you to carefully review the instructions for saline soaks, and you should note that a saline spray is not as effective as a saline soak (or the Briotech spray I suggest for aftercare).