Antibiotics

Hi guys! I just like to know something.

Since I am wearing my braces, I got an appointment to my dentist every month and she scheduled me to remove the extra tooth. So, I needed to take the antibiotics for infections. For instances, What if my boyfriend finished me inside last three days and the said appointment is today. Do you think I’m already safe since we have no contact for three days?

Do I have any chances to get pregnant since the sperms are still there while taking antibiotics?