Day 41 of my cycle

So I have the birth control in my arm..it expires in October. My SO and I have been having alot of sex. No protection. my period is usually predictable and will last a good 5 to 10 days. Last month I have a very light period where it only showed on toilet paper when I wiped and lasted 3 days. I'm currently 8 days late and I've been having pregnancy symptoms but urine tests and blood test have all came back NEGATIVE... 😭 Anyone ever experience this and what was your outcome...