Late Period...Grrrr

My husband and I have been TTC for 7 months now and I am so frustrated. I know many woman struggle for much longer but 7 months seems like an eternity. We have used this app to <a href="https://play.google.com/store/apps/details?id=com.glow.android">track fertility</a> windows and periods and nada.  We are going to try ovulation tests now but I just wish my period would quit messing with me. I am a week late now and took a test last week and it was negative. Why won't AF just come so we get it over with and try again this month?! :(