I've been on lo estrin birth control pill for over 2 years.  I have heard it is okay to skip the placebos and take the pills back to back for 2-3 months. I usually don't get my period during the placebos and when I do it's only spotting for a day or two once every few months. Is it okay to skip the placebos one month? side effects? Will the pills still prevent pregnancy or only prevent me from having a period that month?