still bleeding

So two weeks ago August 7th I started my period and I also started birth control my first ever birth control pills. 
Usually my period last five days this time it almost went into a full two weeks 
I'm still having red spotting why is this happening ? I want to have sex and I can't Cus it seems like I'm still having a period without the cramps and not as heavy 
HELP 😩😩😩 is it the birth control pills !?