Missed period?

My period is 2 weeks late ? My period has never ever been this late. Could it be because I had (PROTECTED) sex with a man for the first time in two years? Could it be because I started taking biotin pills? I stopped taking the pills a week ago because I thought they might be interfering but still nothing. I took a pregnancy test and it said negative but I’m still freaked. I also have tons of clear discharge. I’ve also been getting AWFUL cramps. But no period. Help?