No period

I missed my period for a week now. I have discharge heavily. I cramp a little. I had sex during ovulation, I am not on birth control haven't been for over years. We still been having sex even though I missed my period. Unprotected. And finished inside me everytime as usual. BUT, I bought these pregnancy test from Fred's. $1.50 and they both said negative. I took one mid day, and then waited 2 days later and took it in the morning. It said negative with a little glitch.. I'm not stressing over it. But I do need some answers from others perspectives. 

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