I Took Diflucan The Morning After Ovulation. Also, We Had

I took Diflucan the morning after ovulation. Also, We had sex 2 days before I took Diflucan. Is there a chance I could be pregnant since antibiotics decrease birth control and we haven't used a back up (condoms). I noticed pink mucus after having sex which was one week after taking Diflucan. My period is due in 2 days but I have only been spotting small amount of brown discharge.