Talk to Gynecologist on Pregnancy

I’m Hypothyroidism patient and TSH :3.5 but now I’m taking 100 msg(more dose than before pregnancy).my last lmp was 13 june.i had my test positive on 15 27 July my doctor told me that gestational age is only 4 weeks and heart beat is not after taking progesterone and hcg injection after 10 days fetal pole is visible but no cardiac activity and it’s 6.1 weeks.i had some brown discharge with a small black should i do now.