After 11 days of unprotected beta-hCG ratio, can it come out positive?

Yes, after such a period of intercourse, you can perform a beta hCG test and it can give a reliable result. A pregnancy test that detects beta-hCG in the blood can be performed about 8-10 days after conception, i.e. before the date of the expected menstruation. The urine test should be performed only on the day of the expected menstruation, because earlier the result may turn out to be falsely negative. I encourage you to familiarize yourself with useful materials in the topic: https://www.gdziepolek.pl/kategorie/domowe-laboratorium-testy-ciazowe-narkotykowe https://www.gdziepolek.pl/kategorie/ciaza