Period? Implantation? or ?

Hello all my Queens..

My Fiance and I are trying to get pregnant. Just a little about my cycle. Last usually 30 days and pretty normal. Last period was Feb 4th and my expected is March 7th. About a week and a half a go I started light bleeding that's very similar to this photo and only spotted for 2 days then stopped. About 3 days ago I started again but still no heavy flow just a bright pink and sometimes really bright red color. sometimes it comes out brown too. My boobs have been Fuller and way heavier for the past 2 weeks but I've had some negative tests. I'm not sure what's going on? pretty much from Feb 14 until now we've had sex every other day.