Hi, My Last Period Was 24th March 2016 With 4

hi, my last period was 24th march 2016 with 4 days bleeding and again 10 days later there is spotting ( 2 days) and again 15 days again spotting ( 2 days). iam married and trying for pregnancy also from last 2 years. me and my husband did all the tests and reports are normal. iam over weight too and trying to reduce my weight also..Can u please advice me reg spotting twice between periods is dangerous?