I am very sorry that it took me so long to post the result.
The nurse could not find any boy's parts. She also said it can be a girl, but it can be a boy as well. It was very hard to see, because the baby cross it's legs. They have only 2D u/s. They said, if they would have a 3D u/s, they would probably see the gender more clearly. There is still a chance for me. My next u/s will be in 6weeks. So, next time I will find out for sure. Now, I have to wait another month. The heart beat was hight too. It was 160ps. My doctor told me it will drop down. I also asked him about Pink or Blue test. And he was very skeptical about it. He said that it is very hard to find fetus DNA cells in mother's blood at 8weeks of pregnancy from three circles of blood. He told me not to trust the test result.