Period -

I been on the pill for two years or more straight, lately this year I completely missed a period In may, wasn't pregnant obviously. This month I got my period for two days a week early, I realize because I accidentally took two pills In one day, probably got me ahead. Anyways, neither to say I always take my pill every day morning time. & my boyfriend never cums Inside of me. But I didn't have my period the week I was suppose too. I've went to my mom about this situation & she believes I'm fine but I'm still concerned...