Someone help

hello, I’m currently 15 days later for my period over two weeks. I’ve taken so many home pregnancy tests and there all negstive. Today I went to the doctor to have a blood and urine test done and the urine was negative. I’m awaiting the results of the blood test. Can someone tell me why on earth is my period two weeks late and negative tests? Does this happen is it it common? I’ve never missed a period this late in my life. I did get pregnant over a year ago and was late but had a positive test.

I don’t know what’s going on, I’m awaiting the results from the blood test. Is is it possible for that to be positive or is it rare? Is it hust that hcg isn’t appearing in urine tests?

If it’s not that what are the other reasons why my period is two weeks late I haven’t been overly stressed or excercised a lot it hasn’t been much different idk what’s going on

Any input would be so appreciated thanks 🙏🏻