It's baby season AGAIN

Sarah • 27. Married. My son was born 2/22/16 and his little sister 7/5/17
I feel like for the past two years that we have desperately wanted a baby, it has been baby season for everyone else! Literally, everyone around me has been having babies or getting pregnant. Of course I'm happy for them with a little bit of envy. I'm in my two week window right now but I swear I feel my period coming on/ for some reason I've been getting it early. Typically I get my period every 30 days but for the past 2 months it's been every 25 days... Is this still considered a regular period? Could it mean I am not ovulating? Help!