I NEED ANSWERS PLEASE ANYONE!!!

Venetia • Ttc For 8 Months
MY CYCLE IS ALL WACK I OVULATED SUPER LATE DAY29 JULY 12 HOW MANY DPO 8 RIGHT WHEN SHOULD I TEST? I TESTED SAT NEG I SO SAD?? WITH ALL THE BFN I HAVE A APPT JULY 31 BUT I WANNA FIND OUT SOONER THANKS IN ADVANCE PLEASE DNT JUST READ AND NOT RESPOND?? THANKS