I had my last period on August 10th, and my periods are always 28-31 days apart. I haven’t had anything since then and starting yesterday I’ve been cramping really bad and have very very light pink blood? I’ve never had this before and it’s always been darker. I looked online (I know it’s a bad idea) and I saw something about implantation bleeding? I’m not sure if that could be it or not. I have taken 4 test and the first one was positive but the 3 after that are all negative. Does anyone have any suggestions on what could be going on? I am starting to panic a little because this hasn’t ever happened before.