Help with the morning after pill?

Hi me and my boyfriend had sex around 4 in the morning last night we did not use a condom and he did not finish inside me (it was on my stomach.) I took a morning after pill today at about 1pm I was just wondering if there’s any thing I should be expecting to happen? I’m not really concerned about being pregnant I think we’re fine he just wanted to make sure because we are usually EXTREMELY cautious I’m supposed to start my period in nine days. Will my period come early or late or something? I don’t really know what to expect I’ve never taken a morning after pill.