detail scan

Just did my detailed scan just now. Was being told that i have low lying placenta. Searched the forum n found that some ladies have undergo this too.. Gynae didnt say its very low though. baby is healthy as what gynae said and she didnt give any bedrest. She said i could walk as per normal. Will this cause any miscarriage? What will happen? This is my 3rd pregnancy... last 2 was chemical/lost at a very early week. :( praying for a smooth pregnancy ahead..