Nervous but hopeful

Br

I had miscarriage jan 2018 had a negative test in nov then dec positive dr said I was about 9 weeks along miscarried Jan 4 tested for March 11 got a positive I’m just super nervous since the only symptom I’m getting is sore breasts . Went for an ultra sound due to light spotting dr said it’s early in my pregnancy and all they saw was a sac is that normal ? Just preying for the best this time around 💕