What is right times to check pragnecy

Ayesha
Hello friends i want to ask my period is late 4 days only i am trying to conceive 9 months but didn't Everytime i check pragnecy but its negative this time my husband didn't bring pragnecy test strip for me i am worried am i pragnect or not? do i check at home what is the right time of check pragnecy. I m still worried of negative result. :(