Hello friends, My last PMS is 12/1/2021. I done home test on 13/2/2021. My test is positive. I went to doctor on 16/2/2021. She said no sac is visible yet. She recommended a serum beta HCG blood test. I did it but my results will come tomorrow. I had 3 miscarriages before. I have a 4 year baby girl. Because of my previous history I'm worried about my pregnancy. Is it ok or not if my sac is not visible yet. Please help me.