LATE PERIOD PLEASE HELP!!!

I haven’t had sex in over a month. The last time i did have sex I had to take Plan B and ended up getting my period 3 times last month. Currently I am 11 days late but have my usual period symptoms such as bloating, sore nipples and a larger appetite. I’m very worried that i could be pregnant but I’m also wondering if it could just be a side effect of taking Plan B. Please help me out!!!