Many of us have had false alarms in the past. You should be damn sure before you make accusations.
I have no connection to this establishment, but ......how you gonna make it up to the girl when you find out to didn't get something from her?
If you feel so strongly, but have no proof, approach the girl first, give her the option to get tested herself, immediately provide you the results, or you will make such a post as you did.
Or...
Post a GENERAL precautionary warning for all mongers of AMPS in Midtown that you "think" you might have contracted something,....that they should take extra precaution....and you will post updates in the future. Without calling out one particular establishment or girl.