Super weird!!!!!!

So last Friday I figured Eh I don't want to waste the OV tests... So I tested and got my peak... (It was nice to only use one test) but today I have back pain and some pink spotting... What is going on? I'm assuming only 7 maybe 8 DPO?? Is my cycle that wonky?? I felt like I was ovulating (EWCM, cramping etc) we aren't really trying this cycle and I don't think we will next cycle either I really don't want to be big pregnant throughout CA summer and I would be if I'm due in Nov. And I don't want to have a Christmas due date!