BFN :( I don't understand

Ok so I just took a pregnancy test I'm on my 11 DPO and my periods supposed to start in 3 days...I've had early symptoms of pregnancy during my DPO & sadly it came out negative...I don't understand. Do you all think it was too early to take a test? Other girls have positives on their 11 DPO and mines was negative :( help me :(