In the situation described, there is no risk of pregnancy. There is no reason to worry. The sperm that ended up on the pants, i.e. was also in an environment unfavorable to sperm survival, could not get through the material and vagina to the egg cell for fertilization to occur.

I attach similar threads:

https://www.gdziepolek.pl/opinie-i-pytania/96342/witam-zakladajac-ze-partner-mial-wytrysk-w-bieliznie-a-na-niej

https://www.gdziepolek.pl/opinie-i-pytania/124834/witam-ocieralem-sie-z-partnerka-i-nie-miala-na-sobie-zadnej-biel

Here you will find information about sperm viability: https://www.gdziepolek.pl/opinie-i-pytania/117110/witam-mam-dwa-pytania-1-czy-jest-mozliwosc-zajsc-w-ciaze-gdy

For fertilization to occur, it is necessary to introduce live sperm into the vagina. Touching intimate areas with semen does not pose a risk of fertilization.

To be more precise, I would have it on my hands by some miracle and I would touch my underwear with my hands where it meets the vagina and I would normally wear it. I feel very stupid asking about such things, but it doesn't leave me alone, I'm constantly looking for new information

I'm sorry for asking you so much and bothering you, but even though I use contraception in the form of evra patches, my thoughts don't leave me alone. After 20 hours, does it matter where the sperm is, whether it's the bathroom, clothes, water, whatever, even if I touched it, sat on it, put on the clothes it was on, or when she wore her underwear, she wouldn't be able to impregnate her? I read on the internet that the lifespan is about 18 hours, but I don't know anymore, I prefer to ask specialists