Hi, I have pcos and thyroid proble. For past several years. For thyroid im taking 12.5mg and 25mg tablet. We are trying for a baby and doc suggested to take Letrozone on 3rd of thr period for 5 days after which i went for follicular study on 16th day i was injected with hcg 5000 IU IM. After the shot today is 18th day and still my period hasn't come yet and i also took a bet hcg test which is <2.39, now when will i get my period how long can i wait, will my period come automatically by the intervention of hcg?