Hi i'm on Lo Loestrin Fe and my first month of using this pill i did not get a period. I was supposed to get it Dec. 27th. My period is now 10 days late and today i started to have reddish brown spotting. My boyfriend and I always use a condom and i havent missed a pill once. My back also was hurting when i woke up this morning. Since i missed my period i've been taking pregnancy tests and they've all come up negative. Has this ever happened to anyone else? I'm nervous.