hello brown spotting can be a sign of early pregnancy but it is not diagnostic of pregnancy spotting can also happen mid cycle near ovulation in some women u had periods about 10 days before being intimate & u r having spotting for 3 days since then that means u r almost mid cycle now although he had not entered but since there was contact with genitalia still there is chance of pregnancy if ur intimate episode was within 3 days from today u should go for morning after pill alternatively u should wait for ur periods if ur periods r delayed please go for urine pregnancy test after 4 to 5 days of delay with r first morning urine please vote helpful if this was able to allay ur worries