Late period or implantation...

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I was two days late and took a test and it was negative. I took an ovulation test too and it had a faint line. On the 3rd day I felt mild cramping and only have expelled a small amount of mucus-y brown. This morning the same except a slight tinge of pink. So I take a shower and there is no blood just thick normal discharge. What is going on? Should I try to take another test? If it’s negative should I still try to take another until AF shows?