My OB just called me after my 20 week ultrasound and told me I have a low lying placenta and I have to go back at 28 weeks for another ultra sound to make sure my placenta is migrating up. She assured me that it was common and that it is was not placenta previa and not to be concerned but me being me I'm in panic mode. Anyone else ever have this? I could use some reassurance or advice. Thanks ladies!