Birth control.....with the possibility of being pregnant??

Nikki • Mommy to Both💗 my 5 angel babies👼 #3 on the way❤️

So I have been on birth control pills since July 7th. My periods have been regular with no problems. 27 day cycles and my period is usually 4-5 days long. But now I'm worried. I'm 2 days late for my period right now. Has anyone became pregnant while on birth control pills??? (I haven't missed a single pill and take it daily!)