WHEN IS THE RIGHT TIME TO TEST

Nothing on the internet seems to help me. I see woman get + at 6 dpo. Others not untill a missed period (5 days after your period is supposed to come.) when is it. What is the time to test. Please I used a frer and it said negative I’m 4 days away from my excepted period. So 14 dpo. I really need advice help. Because I haven’t been symptom spotting but who gets nasua before their period? My boobs are so tender; I’ve been having milky white discharge, last night I had pinching in my lower back. I just don’t understand why pms and early pregnancy signs are so similar. If it is pregnancy symptoms I would have to have a implanted egg making the hgc.. so 🥺 I don’t know