Placenta Previa

Hello ladies, just found out i have placenta previa completely covering my cervix i am.14weeks. Has anybody else had this problem and had a good pregnancy. I feel like all my excitement of being a mother just went down the drain. I had my last check up and my Doc. Never told me anything was wrong she said light exercise was ok and and sex too, but i have read some articles and things seem to be more serious than i thought, they say bed rest, no sex, no exercise. So now i am concered on why my doctor never mentioned anything. I will be giving her a call tuesday since they dont open this monday. TIA.