HCG level

So I got my first but very faint positive on February 19th then another positive on February 22nd. Took another 2 tests on the 26th after my missed period. I called my doctor and told them I had the positive tests and they went ahead and made me come in on February 28th. I had blood work done and I got the results today and my hCG level is 711.02. And the woman told me I was only 1-2 weeks pregnant. I’m just confused how that is possible?