My bar soap had gunk on it after I cleaned my sink. I cleaned it off but used it to clean my makeup brushes. I already used them. Should I be worried?

Soap Protects. Believe it or not, regular bar soap, even the ones that don't say "antibacterial" are quite effective antimicrobials. Unless you have broken skin on your face, having a "dirty" bar of soap that has been used to clean your face or body will not hurt you. Your best course would be to pay attention to your skin over the next few days and report any breakouts or rashes to your doctor.