I'm 22 and i've been on yaz birth control for two and a half years . i have sex 3 or 4 times a week. Every month i get my "period" on the third or fourth day of white pills. Last month i got it the first days of the next pack, it was light and lasted 4 days as usual. This month i've been really stressed about moving out, work and that i recently had an uti and due to antibiotics (which i research and found nothing about if they make the pill less effective it was bactrym for 4 days, sultamicilin 1dose and fluconazole 1 dose). All that happened on the first week of this pack. Now i was supossed to start my period 2 days ago and i'm just having a little brown sometimes thick spotting for 3 days. I know i should test but right now i'm too afraid to know for sure. Has anyone been in this situation and how did it ended?