Hi, and thanks for your medical question on eHealth forum!
Since you missed a period in between, go for blood HCG estimation, as this can give a more confirmatory picture of pregnancy or miscarriage, both of which are a possibility in your case. Otherwise it can also be hormonal imbalance, PCOD, thyroid problem which is causing these light bleeds.
Since a confirmed diagnosis cannot be given on net please discuss these possibilities with your gynecologist once. Hope this helps. Take care!