I am not putting your info in quotes, so that you can remove it when you want to. I would also suggest that given the nature of this thread and how strict your family/culture is, you might want to ask one of the mods to delete this thread in its entirety after you stop posting here.
Ok, so when you went the 2nd time to the doctor on April 9, it was the 26th day you went to the doc on. You therefore fall in time frame and beta hcg level
"4 Weeks: 5 to 426 mIU/ml" (your hcg is 171 mIU)
Source:
https://www.verywellfamily.com/the-pregnancy-hormone-hcg-1960127
Also, the blood test for beta hcg is done after the initial urine test comes out positive. Do you remember if the first urine test came out positive?
If the doc said your value is too low for 6 weeks (actually it is 4 weeks), then even if you got preg initially, the pregnancy is not progressing as it should and the embryo not dev. as it should, so perhaps that is what it means when he says preg. will not result. However, you might be translating from Turkish to English and something seems to be getting lost in terms of info and what he exactly said.
Now, since your levels are higher than 25 mIU after 4 weeks (because for me 4 weeks is the time between intercourse and apr. 9th), it seems positive for preg. but beta hcg is too low than it should be, so not developing properly.
https://americanpregnancy.org/getting-pregnant/hcg-levels/