Hi your writing is very confusing. For pregnancy
to establish, it must pass 5weeks, so no question of 4 weeks pregnancy. According to your LMP, you believe it to be 6 weeks. But in USG Sac measures only 5.3mm which has just reach the visible state by 5th week of pregnancy when foetal heart pulsation cannot be visualised. It can be rarely visualised at 6 weeks, but clearly by 7 weeks. So in my opinion there is no hurry of Susten
medication. Repeat USG after 1or 2 week and see the progress. White discharge could be due to effect of Susten.