i had PCOS and taking up pills for almost 3yrs.the last pill i used is diane,last two months(july-aug.-spet.4(5) .i've decided to stop taking up pills and planning in getting pregnantT then got my period on sept.8-13...my bf and i had a unprotected sex(sept.16-17)...then last sept.23 up to now,'been experiencing vaginal bleeding just like having my period again....is it a withdrawal effect of the pills i take in before?