Im so confused help please I'm 7 days late now my last period was the 7th till the 12th August took a test its negative but im confused cause I was going through my period cycles from March an there all different like march I had a 23 day cyle then in april I had a 20day cycle then in may I had a 21 day cycle then June I came on twice first cycle was 24 day an second one was 25 day cycle then july I had a 19 day cycle then August I have 22day cycle my last period was 7th aug to the 12th August an was due back on the 28th of august but nothing yet any advice ?? xx