BC pill interactions questions

Samantha

Sooooooo, today I had to get some antibiotics and according to drugs.com the antibiotic (cephalexin), has a moderate interaction with my BC. -_-

I looked on the pamphlet to find some more accurate information but it says nothing about interactions. Anyone want to shed some light on this? Do I just have to use a back up form of BC while taking the stupid antibiotic?