Complete placenta pevia

Sara • I'm a mama of two little ones Rose 15 months and Finn 3 years old another one on the way❤️
So at 20 weeks I was told I had placenta previa and that not to worry because it usually fixes itself by 30 weeks but now here I am 30 weeks with complete placenta previa and it low lying and the umbilical cord is attached on its side instead of in the middle... And I have been having the stabbing pains in my vagina which kill! Also baby grace is extermly low does any have or had his experience?