Spotting but negative tests

Maddie.

Last month, I started spotting on the day I was supposed to start my period and it lasted two days. I took a pregnancy test but it was negative. I never got my actual, normal flow period, but I thought maybe it was just one of those months. This month, on the day I was supposed to start, I spotted again. It’s not even close to what my normal period should be but still have negative tests. I’m so confused