7 days of spotting

Maddie • TTC FOR #1 going on 7 years. step mama

So I started to spot on CD 26 and usually I’ll start a flow by the 27 or 28. Ive not had a single full tampon. And every time I’ve worn a pad nothing comes out onto it. The spotting is light pink or brown. There has been pretty much just little bits of spotting for 7 days now. I’ve been wearing tampons during the day with the expectation that I was gonna start a medium flow but it still hasn’t happend. I took a pregnancy test and it came out negative. Any ideas?? I have a regular period and I usually spot a day or two before. But this one is just weird. I don’t know what’s happening.