I don't understand what my body is doing!

Cierra
I'm 7 days late, have had several bfns, and went to see my Dr on Friday. She said she thinks I'm pregnant but can't tell me for sure because the urine tests are negative. She said to wait until Wednesday to get a blood test. I'm dying waiting like this!! Every time I go to the bathroom I have a mini heart attack thinking I'm gonna see red, and I never do. But I don't wanna convince myself I'm pregnant yet because we lost a pregnancy in June and I don't know if I could take that kind of disappointment of hearing I'm not after thinking I am again. I just want to know either way! Any body else had a similar experience or heard of this kind of thing? Seems way too late to get bfn if I'm pregnant!