No sex drive

I haven't had a sex drive in a while. And I'm scared to tell my fiancé cause he always seems like he wants to have sex. Everyday. He teases me and tries to flirt in sexual ways.. But I just don't feel it. We have had sex before. Last year we would probably do it 4-5 times a week and I loved it and wanted it everyday. But now I'm just not feeling it anymore and i dont know what to tell him. I did start this new birth control last year.. Could that be it? I dont know what to do. Help please? Any ways to get me back to that sexy love feeling?