Placenta Previa

Okay ladies I am so scared and need your advice/help. I went in for my anatomy scan today I am 18 weeks 2 days. I was told it looks like I have placenta previa she didn’t say if it was total or partial and also instead of having the three vessels in the umbilical cord she has two.. everything else looked great as far as her weight, heart, brain, liver all her organs looked great but I am so scared I never had this with my first pregnant:/ so please ladies if you have experienced this let me know how it went for you! Thank you so much for reading and god bless!