Breakthrough bleeding.

Has anyone had breakthrough bleeding a few days after their period was due? I took a pregnancy test a few days ago and it was negative. It was only a cheap test but I just had this feeling something was different. 
I then decided to wait and today I seem to have started bleeding. It's very light (which is not like me at all) and diluted (watery). It's a pinky red with some brown. 
I was wondering if any mums have had this experience during early pregnancy? Should I retest in a few days or just take this strange bleeding/spotting as a period?
Thanks!

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