Complete Placenta Previa

Dear Midwife,
I am 22 months along and have been diagnosed with complete placenta previa. I also have to take pills to keep my progesterone levels up which my mom had the same problem so I kind of expected that. But the previa completely threw me for a loop. This is my first pregnancy and I am scared to death. I am going to have my second ultrasound tomorrow so find out what I am having and to see if the placenta has moved any. I am a CMA and luckily have kept my books. I have read up on it and looked it up on the internet but so far I have heard nothing positive or good. I just want to know what my labor options are and how risky they are.
Please help,
Brittany