After 15 days of intercourse, is the result of the pregnancy test reliable?

Yes, after 15 days after intercourse, the result of the pregnancy test is reliable. I am attaching a helpful article: https://www.gdziepolek.pl/artykuly/test-ciazowy-jaki-wybrac-i-kiedy-zrobic

Would a 10 mIU test show a visible line 14 days after intercourse? The test was done from morning urine, after 8 hours of rest. I'm afraid that I might not have noticed it, but I looked very carefully

To @pomocy:

Yes, after such a time, the line would certainly be visible.

I will also add that I protect myself with a contraceptive implant and I have not had a period for 3 months

Good morning! I did a 10mIU pregnancy test 14 days after intercourse with morning urine. It came out negative, I illuminated it from below with a flashlight and still nothing was visible, would the test show a line visible to the naked eye after such a time? I did two tests and both were negative.

To @Pomocy:
The results indicate that she was not pregnant.

Does beta hcg 10 days after intercourse 0.2 and beta from blood 18 days after intercourse result 0.20 mean 100% no pregnancy? I'm stressed, I don't know if I still need to do the tests

So beta from the blood should detect pregnancy 2 days before the period?

To @Pula:

Yes.