Girls, hi. I have such a question. The thing is that I've been late for…

Girls, hi. I have such a question. The thing is that I've been late for seven days now. The thing is that the test shows one stripe. To the gynecologist I went, she looked at me and said that my due date is more than four weeks. It's like figuring out how pregnancy tests show two stripes right away, but this doesn't show anything.