Birth Control Pills and Antidepressants?

Question

I recently just got birth control and on the label, it says some medications can interfere with the effectiveness. I read online that antidepressants interfere with this. Does anyone know by how much? I couldn't really find anything online about it. Can someone please explain it in more detail? 
*I take Sertraline (Zoloft) as an antidepressant 
*And I take low ogestrel- 28 as my bc pill

Answer

I take both and so far I'm not pregnant and I haven't used condoms all 4 years with my bf