implantation bleeding

i had my 1st miscarriage last july and found out im pregnant again last week but now im having spotting or implantation bleeding for almost 7 days on and off my ob prescribed utrogestan for 15 days until mawala yung bleeding then tvs meron po bang nakaranas ng spotting longer than 3 days...im worried because of my previous miscarriage and im high rish pregnancy because of pcos....