Okay help!?

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I’m very irregular with periods I get symptoms of a period no period but this month as usual I got acne moody and everything and I woke up one morning with very light pink blood with only one wipe then nothing now just watery cm and no period but slight cramps my last period was in November and I had sex 11 days ago I don’t know when I ovulate but could this be implantation bleeding!? I’ve taken a test but negative is it too early