Missed period ??

I missed a period in February and still haven't started.. Last year I missed November and December.. Is this normal? I've always been very regular and on time with my periods.. I've taken pregnancy test and that's not what's going on, I got all negative. I had an iud paragaurd in for 2 years and had that taken out in December due to pain and found out it had been in sideways and halfway out,.. Could that have something to do with it? Any advice or anything would be greatly appreciated.