This isn't a period, what is it?

So my period was supposed to start like 4 days ago and I've been getting this for the last.. 2/3 days? A few days ago it was alittle heavier but now it's almost gone completely. My periods never start like this. No cramping or PMS symptoms. Took a pregnancy test today it was negative. Any ideas as to why or what this is? I have an HSG test next week and nervous this will mess it up.

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