My tongue is pierced and it appears that i have oral thrush on my tongue yellowish after taking antibiotics will i get sick or another infection?

Thrush: Thrush is usually white cotton ball type 'lesions' that wipe off and can appear red at the edges. People with pierced tongues often get a yellow discharge/infection from not keeping them clean enough. Please have your tongue checked by your dentist or oral surgeon.

Yes: It sounds like the yellowish tongue is due to a fungal infection. This can be treated with rinses and oral medication. See a dentist to identify what treatment is best for you.