Confused!!! Any suggestions

Colena

So I was suppose to start my period aug 30th no show of AF now I'm 7 days late no sign of AF went to the dr today got a negative pregnancy test(urine) ughhh wats going on I'm sad and confused this is very stressful I just thought it was going to come back positive... but why is it negative and I'm a week late... 😩😩😩has this happened to anyone else and they ended up being pregnant?