Is there chance for pregnancy to grow?

Period came one day late but lasted for close to 3 weeks at first i thought it was hormones imbalance due to the fact that i stop breastfeeding that same month but decided to check with gynae. And after a scan turns out i was pregnant but i didn’t even know it. I went for so many drinking sessions and was on my weight loss journey, only eating a meal a day. gynae said sac seems to be empty (blighted ovum) but it might be because it’s too early to tell estimated gestational week is 3/4weeks . So gynae said to let nature take its course and check back 2 weeks later. But i feel so so guilty not knowing i was pregnant and doing so many things to harm it. Just asking if any mummy have blighted ovum misdiagnosed? And if it’s just too early to see. Also i am still bleeding everyday and am so scared to even head to the toilet cause every time i go i just see blood flowing out. Any mummy had bleeding early pregnancy and go one to have a healthy pregnancy? I know chances are not high but just want to have some hope. #advice