Confused?? Insight please

I just found out that I am pregnant. My second pregnacy was high risk I remember having a ultrasound at 8 weeks due to bleeding.When I went in there were 2 eggs but only one with a yolk sac, after all of that with other surgeries I had when I was younger on my uterus they did ultrasounds every 2 weeks until I was 36 weeks. Now finding out my first appointment is over the phone with a nurse at 8 weeks and then doctors appointment not until 12 weeks. So I'm confused and a little concerned this will be my 3rd pregnancy and in each one an empty egg. Any insight?