Hello sir I had recently exposure from syringe by a clinic actually clinic staff use one needle to drown medicine from botal and than use other middle to inject on patients that's why with in 20 hours I take PEP MEDICINE viropil and I take all the medication for 28 days without missing any dose and done 4th generation test on 27 th day of exposure which is negative now again when should I retest and which type of test should be done now today it's 32 days of exposure