Hi Sir, After 6 week and 3 days, two very light brown blood spot came today. We went to Doctor and TVS done. No sac visible. Doctor done Beta HCG test and advised to revisit on Thursday when this report will be available. I had missed abortion in October 17. At that time also no sac was visible after 7 week. I am afraid for same thing this time and unable to know causes. Torch, cbc, my husband semen test etc everything fine but still. We are waiting positively but still. Please advise.