New girl

Hey ladies I am new to this & have been Ttc for 6 months 
I use clearblue digital and have been getting peak readings every month now ... But nothing :-( 
I seem to hit high fertility on days 9-11 after my period but it's really getting me down that it's not happened 
My boyfriend & I try to have sex on these 3 days but I am open to suggestions & tried and tested results! 
A x