Implantation? Hellppp

Okay so, about 6 days before my period is due I was having some back cramps and having some light pink spotting, which got lighter and went away. The picture is a few hours after the first bit of spotting that was pinker. I'm now 4 days away from my period and having negative tests? Am I still too early to test? I'm still having cramps but no bleeding. I'm having a lot of discharge so I keep thinking I'm getting my period but nothing is there. My husband and I were doing the pullout method and I know for sure he never finished in me so I'm worried it's all in my head. I guess I'm just confused and rambling. Lol anyone have any ideas on why that would happen if I'm not pregnant? I'm getting excited about the possibility of having a baby but I feel like my chances are low since we were pulling out and my tests are negative :(