could be depending on yer last period and when yu expect to have yer period...this brownish spots could be spotting at the happening :) and that usually means if yu are preggo then yer bby is attaching to yer uterus...but i would take a test and be sure after yu missed yer period i would preferr although its all up to yu :)
GoodLuck hunn!
It's possible. Since it's already been 2 weeks since you had sex, you can take a home pregnancy test and get an accurate result. Take a home pregnancy test tomorrow morning using first morning urine, which is the most concentrated. Then use this as your learning lesson to be more careful next time. Hope it goes well.