Placenta previa???

Vanessa • Hi my name is Vanessa I'm 27 from ca. My husbands name is David. We are expecting our first baby!!Due August 21, 2016!!
I had my 19wk ultra sound and the tech told me that my placenta is covering my cervix and I should be away from this area. Does anyone have knowledge or experience with this? I'm trying not to think about after I googled it 😒 but I can't help to worry and my next dr appt isn't till April 18th hopefully my dr will call me in a lil earlier to ease my mind.