What's wrong with me???

Am I the only one that sits around trying to figure out what's wrong with me... I have two girls 13 and 11... It took me a year to get pregnant with my first but it happened... And my second was a big surprise because we hadnt even tried... Fast forward to now... I've been ttc for 2 years... I can't even get my hopes up because my period is right on time... I never even get a day late just to hope... I'm just so frustrated with myself... Today I find myself reading about blocked tubes... It's always on my mind