When will a pregnancy test be accurate for me?!!?

Hi, I am having alot of weird symptoms (dizzy, cold, stomach issues) that are not PMS and I need to know if I am pregnant. I keep getting negative HPT's. I ovulated on the 22 of May and my period is due the 7th of June. I think I am 11 DPO. I know a lot of other women are saying they got a BFP on day 11, but I also have a longer cycle (33 days). Does this mean I am not pregnant or am I testing too soon? When did you test pregnant? Any advice and knowledge is greatly appreciated!