I was trying this month 2 get pregnant, period came 4 days early, ovulation predictor only tested positive 10 days ago and no typical basal temp, why?

Abnormal. So either this was a weird month or a sign of other things. If it happens once that is fine. But if it continues to happen then it is a sign of a problem with the ovaries and eggs where the ovary does not produce enough hormones to adequately or optimally prepare for pregnancy. I would wait and see what happens the next 2 months before being over concerned.