Not sure! help ladies!

Kayla
So I told y'all about my boobs being sore... Well they still are.. And I took a preg text last Tuesday the 29th... BFN... And Friday New Year's Day I noticed slight bleeding... Not enough for a tampon but it was there... Saturday it got a little heavier... Enough for a tampon but not enough to fill it up.. And I noticed it was like a brownish red... And my periods when I do have them are VERY heavy. What could it be? Could I be preg and not know or is my period just acting weird? 
All input would be helpful. We've been TTC for a year.