My doctor (or pharmacy... I have no idea which -it was sort of a surprise) switched me from Loestrin?1.5/30 to 1/20. I am wondering if I am still protected against pregnancy or if I should have been using a back up method. I had no idea the dosage was different until I read the package and realized the other day. Since it is the same brand/hormone and just a slightly different dosage, should I be okay? I am very nervous