Should I take a test

I've been on this type of birth control for a little over a year (pill). I recently had my first UTI (awful) and had to get antibiotics to fix it. I was taking my birth control simultaneously. About a week ago I woke up and was spotting light pink blood. I was a little off put because I had never spotted on this birth control before. Then two days go by and I spotted brownish pink blood again. Both very light, only showed when I wiped. And now it's been a week and I havent spotted again. We already have two boys and I was just suspicious if my antibiotics affected my birth control. Thoughts?