Today I went for my 20 week ultrasound and the doctor told me I had a low placenta. He wants me to come back in 8 weeks for another ultrasound. He said it should be normal by than but being a first time mom of course it worries me. My boyfriend said not to worry but I can't help it. When the doctor was telling me he didn't seem to concerned but it's still scary. Is having a low placenta common?