Hello.
I don't know how to give stupid answers, so an unsure as to what you expect. It sounds as though you want a guarantee that you're not pregnant, and I can't give you one. If what you've told me is a comprehensive description, then the chances of pregnancy are very low; however, there are no guarantees. If you want to be totally sure you're not pregnant, go to the pharmacy now and ask the pharmacist for emergency contraception.
And please check out the birth control section of this site so that you can learn about how pregnancy can be avoided in the future. Best of luck to you. Dr. J
It is highly unlikely to get pregnant that way because usually our semen dies when exposed in open air. But it is also somewhat possible if his boxer had a opening in front and if he had a pre-mature ejaculation which could've gotten on ur underwear before it was exposed into open. So as the Dr. stated above, get a pregnancy test, but don't worry about it so much!
Good Luck
You have been misinformed. Sperm exposed to air on clothing, bed linens or toilet seats lose mobility (the ability to swim) rapidly. However, they do not die immediately, but only when the semen dries out (2-3 hours).
I'd say i'm 99.9% positive that you did not get pregnant. If your this concerned about getting pregnant you might want to get on birth control as well