Took plan b 3 times in 1 month then started the bc pill. i took a pregnancy test and it was neg. have only had 2 periods in past 5 months. concerned?

Birth Control: has nothing to do with the Plan b. Good for you for getting on birth control. Sometimes you don't have periods on birth control pills. Talk to your doctor about your pill. It may be responsible for you to just skip the placebos and stay on the pill so you don't worry all the time or get on one like seasonal that you don't have periods, but talk to your doc first, probably could do by phone.