My period came on 11/20 and it ended on 11/24. i had sex with my boyfriend on 12/2. my period came back on on 12/5 and ended on 12/9. i spotted on 12/11, can i be pregnant? we do have unprotected sex.

Unprotected sex: If you engage in unprotected sex, then you can become pregnant. If we assume that your 11/20-24 period was normal, then we wouldn't expect it again until 12/20 or thereabouts. So spotting 12/5-9 & again on 12/11 could be from implantation or just irregular spotting. Bottom line, if you want to become pregnant, continue to engage in unprotected sex. But if you don't want a baby, use birth control.